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7(2.5x+x)=30
We move all terms to the left:
7(2.5x+x)-(30)=0
We add all the numbers together, and all the variables
7(+3.5x)-30=0
We multiply parentheses
21x-30=0
We move all terms containing x to the left, all other terms to the right
21x=30
x=30/21
x=1+3/7
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