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66+2x=13x+15
We move all terms to the left:
66+2x-(13x+15)=0
We get rid of parentheses
2x-13x-15+66=0
We add all the numbers together, and all the variables
-11x+51=0
We move all terms containing x to the left, all other terms to the right
-11x=-51
x=-51/-11
x=4+7/11
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