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10x-3=7x+30
We move all terms to the left:
10x-3-(7x+30)=0
We get rid of parentheses
10x-7x-30-3=0
We add all the numbers together, and all the variables
3x-33=0
We move all terms containing x to the left, all other terms to the right
3x=33
x=33/3
x=11
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