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23-3x=7x-7
We move all terms to the left:
23-3x-(7x-7)=0
We get rid of parentheses
-3x-7x+7+23=0
We add all the numbers together, and all the variables
-10x+30=0
We move all terms containing x to the left, all other terms to the right
-10x=-30
x=-30/-10
x=+3
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