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9x+21=5x/2
We move all terms to the left:
9x+21-(5x/2)=0
We add all the numbers together, and all the variables
9x-(+5x/2)+21=0
We get rid of parentheses
9x-5x/2+21=0
We multiply all the terms by the denominator
9x*2-5x+21*2=0
We add all the numbers together, and all the variables
-5x+9x*2+42=0
Wy multiply elements
-5x+18x+42=0
We add all the numbers together, and all the variables
13x+42=0
We move all terms containing x to the left, all other terms to the right
13x=-42
x=-42/13
x=-3+3/13
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