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40(4+8x)+9(-x+7)=0
We simplify the equation to the form, which is simple to understand
40(4+8x)+9(-x+7)=0
Reorder the terms in parentheses
+(+160+320x)+9*(-x+7)=0
Remove unnecessary parentheses
+160+320x+9+*(-x+7+)=0
Reorder the terms in parentheses
+160+320x+(-9x+63)=0
Remove unnecessary parentheses
+160+320x-9x+63=0
We move all terms containing x to the left and all other terms to the right.
+320x-9x=0-160-63
We simplify left and right side of the equation.
+311x=-223
We divide both sides of the equation by 311 to get x.
x=-0.717041800643
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