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`(x-28)+x=90`

We simplify the equation to the form, which is simple to understand

(x-28)+x=90

Remove unnecessary parentheses

x-28+x=90

We move all terms containing x to the left and all other terms to the right.

+1x+1x=+90+28

We simplify left and right side of the equation.

+2x=+118

We divide both sides of the equation by 2 to get x.

x=59

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