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15z+7=20z+7
We simplify the equation to the form, which is simple to understand
15z+7=20z+7
We move all terms containing z to the left and all other terms to the right.
+15z-20z=+7-7
We simplify left and right side of the equation.
-5z=0
We divide both sides of the equation by -5 to get z.
z=-0
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