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8(9-2x-7x)+7(8x+3)=13
We simplify the equation to the form, which is simple to understand
8(9-2x-7x)+7(8x+3)=13
Simplifying terms in parentheses
8*(+9-9x)+7*(8x+3)=13
Reorder the terms in parentheses
+(+72-72x)+7*(8x+3)=13
Remove unnecessary parentheses
+72-72x+7+*(+8x+3+)=+13
Reorder the terms in parentheses
+72-72x+(+56x+21)=13
Remove unnecessary parentheses
+72-72x+56x+21=+13
We move all terms containing x to the left and all other terms to the right.
-72x+56x=+13-72-21
We simplify left and right side of the equation.
-16x=-80
We divide both sides of the equation by -16 to get x.
x=5
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