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12z-3(z-7)=-(5z+7)
We simplify the equation to the form, which is simple to understand
12z-3(z-7)=-(5z+7)
Reorder the terms in parentheses
12z+(-3z+21)=-(5z+7)
Remove unnecessary parentheses
+12z-3z+21=-(+5z+7+)
Remove unnecessary parentheses
12z-3z+21=-5z-7
We move all terms containing z to the left and all other terms to the right.
+12z-3z+5z=-7-21
We simplify left and right side of the equation.
+14z=-28
We divide both sides of the equation by 14 to get z.
z=-2
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