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90=x+(28+x)
We simplify the equation to the form, which is simple to understand
90=x+(28+x)
Remove unnecessary parentheses
+90=+x+28+x
We move all terms containing x to the left and all other terms to the right.
-1x-1x=+28-90
We simplify left and right side of the equation.
-2x=-62
We divide both sides of the equation by -2 to get x.
x=31
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