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-3z+1=7
We simplify the equation to the form, which is simple to understand
-3z+1=7
We move all terms containing z to the left and all other terms to the right.
-3z=+7-1
We simplify left and right side of the equation.
-3z=+6
We divide both sides of the equation by -3 to get z.
z=-2
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