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20-x=-64-7x
We simplify the equation to the form, which is simple to understand
20-x=-64-7x
We move all terms containing x to the left and all other terms to the right.
-1x+7x=-64-20
We simplify left and right side of the equation.
+6x=-84
We divide both sides of the equation by 6 to get x.
x=-14
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