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2.5(7x+1)=55
We move all terms to the left:
2.5(7x+1)-(55)=0
We multiply parentheses
17.5x+2.5-55=0
We add all the numbers together, and all the variables
17.5x-52.5=0
We move all terms containing x to the left, all other terms to the right
17.5x=52.5
x=52.5/17.5
x=3
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