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25z-31z+23z-20z--21z=18
We simplify the equation to the form, which is simple to understand
25z-31z+23z-20z+21z=18
We move all terms containing z to the left and all other terms to the right.
+25z-31z+23z-20z+21z=+18
We simplify left and right side of the equation.
+18z=+18
We divide both sides of the equation by 18 to get z.
z=1
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