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10(8+x)-20=0
We simplify the equation to the form, which is simple to understand
10(8+x)-20=0
Reorder the terms in parentheses
+(+80+10x)-20=0
Remove unnecessary parentheses
+80+10x-20=0
We move all terms containing x to the left and all other terms to the right.
+10x=0-80+20
We simplify left and right side of the equation.
+10x=-60
We divide both sides of the equation by 10 to get x.
x=-6
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