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2x+15+x+15=0
We simplify the equation to the form, which is simple to understand
2x+15+x+15=0
We move all terms containing x to the left and all other terms to the right.
+2x+1x=0-15-15
We simplify left and right side of the equation.
+3x=-30
We divide both sides of the equation by 3 to get x.
x=-10
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