How do you simplify $(12 z - 6) - (- 3 z + 7)$ $(12z-6)-(-3z+7)$ ?

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Answer 1 · 2016-09-02T21:10:30

$15 z - 13$ $15z -13$

Multiply out the brackets - be careful of the negative sign.
Then collect like terms.

$(12 z - 6) - (- 3 z + 7)$ $(12z-6)-(-3z+7)$

= $12 z - 6 + 3 z - 7$ $12z-6 +3z-7$

= $15 z - 13$ $15z -13$

How do you simplify (12z−6)−(−3z+7)(12z-6)-(-3z+7)?