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4z+18=87
We simplify the equation to the form, which is simple to understand
4z+18=87
We move all terms containing z to the left and all other terms to the right.
+4z=+87-18
We simplify left and right side of the equation.
+4z=+69
We divide both sides of the equation by 4 to get z.
z=17.25
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