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9x-40=7x-37+3x+23
We move all terms to the left:
9x-40-(7x-37+3x+23)=0
We add all the numbers together, and all the variables
9x-(10x-14)-40=0
We get rid of parentheses
9x-10x+14-40=0
We add all the numbers together, and all the variables
-1x-26=0
We move all terms containing x to the left, all other terms to the right
-x=26
x=26/-1
x=-26
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