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4(4-5x-4x)+7(4x+9)=7
We simplify the equation to the form, which is simple to understand
4(4-5x-4x)+7(4x+9)=7
Simplifying terms in parentheses
4*(+4-9x)+7*(4x+9)=7
Reorder the terms in parentheses
+(+16-36x)+7*(4x+9)=7
Remove unnecessary parentheses
+16-36x+7+*(+4x+9+)=+7
Reorder the terms in parentheses
+16-36x+(+28x+63)=7
Remove unnecessary parentheses
+16-36x+28x+63=+7
We move all terms containing x to the left and all other terms to the right.
-36x+28x=+7-16-63
We simplify left and right side of the equation.
-8x=-72
We divide both sides of the equation by -8 to get x.
x=9
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