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(15x-12)/3=21-5x
We move all terms to the left:
(15x-12)/3-(21-5x)=0
We add all the numbers together, and all the variables
(15x-12)/3-(-5x+21)=0
We get rid of parentheses
(15x-12)/3+5x-21=0
We multiply all the terms by the denominator
(15x-12)+5x*3-21*3=0
We add all the numbers together, and all the variables
(15x-12)+5x*3-63=0
Wy multiply elements
(15x-12)+15x-63=0
We get rid of parentheses
15x+15x-12-63=0
We add all the numbers together, and all the variables
30x-75=0
We move all terms containing x to the left, all other terms to the right
30x=75
x=75/30
x=2+1/2
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