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5x+3+15x+7=90
We simplify the equation to the form, which is simple to understand
5x+3+15x+7=90
We move all terms containing x to the left and all other terms to the right.
+5x+15x=+90-3-7
We simplify left and right side of the equation.
+20x=+80
We divide both sides of the equation by 20 to get x.
x=4
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