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3x-15+x-5=100
We simplify the equation to the form, which is simple to understand
3x-15+x-5=100
We move all terms containing x to the left and all other terms to the right.
+3x+1x=+100+15+5
We simplify left and right side of the equation.
+4x=+120
We divide both sides of the equation by 4 to get x.
x=30
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