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45x-13=77+90
We move all terms to the left:
45x-13-(77+90)=0
We add all the numbers together, and all the variables
45x-13-167=0
We add all the numbers together, and all the variables
45x-180=0
We move all terms containing x to the left, all other terms to the right
45x=180
x=180/45
x=4
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