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10x+15=7x+4
We move all terms to the left:
10x+15-(7x+4)=0
We get rid of parentheses
10x-7x-4+15=0
We add all the numbers together, and all the variables
3x+11=0
We move all terms containing x to the left, all other terms to the right
3x=-11
x=-11/3
x=-3+2/3
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