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45=15+4x
We move all terms to the left:
45-(15+4x)=0
We add all the numbers together, and all the variables
-(4x+15)+45=0
We get rid of parentheses
-4x-15+45=0
We add all the numbers together, and all the variables
-4x+30=0
We move all terms containing x to the left, all other terms to the right
-4x=-30
x=-30/-4
x=7+1/2
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