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7(90-x)=3(180-x)
We simplify the equation to the form, which is simple to understand
7(90-x)=3(180-x)
Reorder the terms in parentheses
+(+630-7x)=3*(180-x)
Remove unnecessary parentheses
+630-7x=+3+*(+180-x+)
Reorder the terms in parentheses
+630-7x=+(+540-3x)
Remove unnecessary parentheses
+630-7x=+540-3x
We move all terms containing x to the left and all other terms to the right.
-7x+3x=+540-630
We simplify left and right side of the equation.
-4x=-90
We divide both sides of the equation by -4 to get x.
x=22.5
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