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-20=4(7-3z)
We simplify the equation to the form, which is simple to understand
-20=4(7-3z)
Reorder the terms in parentheses
-20=+(+28-12z)
Remove unnecessary parentheses
-20=+28-12z
We move all terms containing z to the left and all other terms to the right.
+12z=+28+20
We simplify left and right side of the equation.
+12z=+48
We divide both sides of the equation by 012 to get z.
z=4
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