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4x-7=10x+21
We move all terms to the left:
4x-7-(10x+21)=0
We get rid of parentheses
4x-10x-21-7=0
We add all the numbers together, and all the variables
-6x-28=0
We move all terms containing x to the left, all other terms to the right
-6x=28
x=28/-6
x=-4+2/3
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