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5z-3+4z+5z-3+4z=156
We simplify the equation to the form, which is simple to understand
5z-3+4z+5z-3+4z=156
We move all terms containing z to the left and all other terms to the right.
+5z+4z+5z+4z=+156+3+3
We simplify left and right side of the equation.
+18z=+162
We divide both sides of the equation by 18 to get z.
z=9
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