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8x+2x=90
We simplify the equation to the form, which is simple to understand
8x+2x=90
We move all terms containing x to the left and all other terms to the right.
+8x+2x=+90
We simplify left and right side of the equation.
+10x=+90
We divide both sides of the equation by 10 to get x.
x=9
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