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(x+45)+x=103
We move all terms to the left:
(x+45)+x-(103)=0
We add all the numbers together, and all the variables
x+(x+45)-103=0
We get rid of parentheses
x+x+45-103=0
We add all the numbers together, and all the variables
2x-58=0
We move all terms containing x to the left, all other terms to the right
2x=58
x=58/2
x=29
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