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45=7+2x
We move all terms to the left:
45-(7+2x)=0
We add all the numbers together, and all the variables
-(2x+7)+45=0
We get rid of parentheses
-2x-7+45=0
We add all the numbers together, and all the variables
-2x+38=0
We move all terms containing x to the left, all other terms to the right
-2x=-38
x=-38/-2
x=+19
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