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3.5x+4x=60.
We move all terms to the left:
3.5x+4x-(60.)=0
We add all the numbers together, and all the variables
3.5x+4x-60=0
We add all the numbers together, and all the variables
7.5x-60=0
We move all terms containing x to the left, all other terms to the right
7.5x=60
x=60/7.5
x=8
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