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x+2.5x=30/7
We move all terms to the left:
x+2.5x-(30/7)=0
We add all the numbers together, and all the variables
x+2.5x-(+30/7)=0
We add all the numbers together, and all the variables
3.5x-(+30/7)=0
We get rid of parentheses
3.5x-30/7=0
We multiply all the terms by the denominator
(3.5x)*7-30=0
We add all the numbers together, and all the variables
(+3.5x)*7-30=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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