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10x+66=5x+186
We move all terms to the left:
10x+66-(5x+186)=0
We get rid of parentheses
10x-5x-186+66=0
We add all the numbers together, and all the variables
5x-120=0
We move all terms containing x to the left, all other terms to the right
5x=120
x=120/5
x=24
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