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x+(x+45)=1380.5
We move all terms to the left:
x+(x+45)-(1380.5)=0
We add all the numbers together, and all the variables
x+(x+45)-1380.5=0
We get rid of parentheses
x+x+45-1380.5=0
We add all the numbers together, and all the variables
2x-1335.5=0
We move all terms containing x to the left, all other terms to the right
2x=1335.5
x=1335.5/2
x=667+1/1.3333333333333
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