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x-(71-8x)=100
We simplify the equation to the form, which is simple to understand
x-(71-8x)=100
Remove unnecessary parentheses
x-71+8x=100
We move all terms containing x to the left and all other terms to the right.
+1x+8x=+100+71
We simplify left and right side of the equation.
+9x=+171
We divide both sides of the equation by 9 to get x.
x=19
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