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10x+21=3x-25
We move all terms to the left:
10x+21-(3x-25)=0
We get rid of parentheses
10x-3x+25+21=0
We add all the numbers together, and all the variables
7x+46=0
We move all terms containing x to the left, all other terms to the right
7x=-46
x=-46/7
x=-6+4/7
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