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(40-z)/(7)=-z
We simplify the equation to the form, which is simple to understand
(40-z)/(7)=-z
Reorder the terms in parentheses
dividing of parentheses
(+5.71428571429-0.142857142857z)=-z
Remove unnecessary parentheses
+5.71428571429-0.142857142857z=-z
We move all terms containing z to the left and all other terms to the right.
-0.142857142857z+1z=-5.71428571429
We simplify left and right side of the equation.
+ 0.857142857143z=-5.71428571429
We divide both sides of the equation by 0.857142857143 to get z.
z=-6.66666666667
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