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5x-2+3x+12=90
We simplify the equation to the form, which is simple to understand
5x-2+3x+12=90
We move all terms containing x to the left and all other terms to the right.
+5x+3x=+90+2-12
We simplify left and right side of the equation.
+8x=+80
We divide both sides of the equation by 8 to get x.
x=10
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