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3z+4-78z-7=287+3z
We simplify the equation to the form, which is simple to understand
3z+4-78z-7=287+3z
We move all terms containing z to the left and all other terms to the right.
+3z-78z-3z=+287-4+7
We simplify left and right side of the equation.
-78z=+290
We divide both sides of the equation by -78 to get z.
z=-3.7179487179487
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