2a - 3b + 4c + a - 3b - 4c =
3a - 6b
3a - 6b
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1.open up the brackets...and revise the signs of the terms in bracket after minus sign
......................................… 2a - 3b + 4c + a - 3b - 4c
2.solve the equation formed
......................................… 3a - 6b + 0c
3.simplify the obtained equation
......................................… 3a - 6b
4.take the common term (or coefficient) out
......................................… 3(a - 2b)
......................................… x-x-x-SOLVED-x-x-x ........................................…
......................................… 2a - 3b + 4c + a - 3b - 4c
2.solve the equation formed
......................................… 3a - 6b + 0c
3.simplify the obtained equation
......................................… 3a - 6b
4.take the common term (or coefficient) out
......................................… 3(a - 2b)
......................................… x-x-x-SOLVED-x-x-x ........................................…
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(2a - 3b + 4c) - (-a + 3b + 4c) = 2a-3b+4c+a-3b-4c = 3a-6b.
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(2a - 3b + 4c) - (-a + 3b + 4c) = (2a+a) + (-3b-3b) + (4c-4c) = 3a-6b
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3a - 6b
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3a - 6b