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4x=(90-x)
We simplify the equation to the form, which is simple to understand
4x=(90-x)
Remove unnecessary parentheses
4x=90-x
We move all terms containing x to the left and all other terms to the right.
+4x+1x=+90
We simplify left and right side of the equation.
+5x=+90
We divide both sides of the equation by 5 to get x.
x=18
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