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15x+5x-100=500
We simplify the equation to the form, which is simple to understand
15x+5x-100=500
We move all terms containing x to the left and all other terms to the right.
+15x+5x=+500+100
We simplify left and right side of the equation.
+20x=+600
We divide both sides of the equation by 20 to get x.
x=30
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