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90=2x+3+x
We simplify the equation to the form, which is simple to understand
90=2x+3+x
We move all terms containing x to the left and all other terms to the right.
-2x-1x=+3-90
We simplify left and right side of the equation.
-3x=-87
We divide both sides of the equation by -3 to get x.
x=29
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