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-2--15-3z=17
We simplify the equation to the form, which is simple to understand
-2+15-3z=17
We move all terms containing z to the left and all other terms to the right.
-3z=+17+2-15
We simplify left and right side of the equation.
-3z=+4
We divide both sides of the equation by -3 to get z.
z=-1.3333333333333
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