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x-15+x+5=90
We simplify the equation to the form, which is simple to understand
x-15+x+5=90
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+90+15-5
We simplify left and right side of the equation.
+2x=+100
We divide both sides of the equation by 2 to get x.
x=50
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