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(6x+21)/3=4x+15
We move all terms to the left:
(6x+21)/3-(4x+15)=0
We get rid of parentheses
(6x+21)/3-4x-15=0
We multiply all the terms by the denominator
(6x+21)-4x*3-15*3=0
We add all the numbers together, and all the variables
(6x+21)-4x*3-45=0
Wy multiply elements
(6x+21)-12x-45=0
We get rid of parentheses
6x-12x+21-45=0
We add all the numbers together, and all the variables
-6x-24=0
We move all terms containing x to the left, all other terms to the right
-6x=24
x=24/-6
x=-4
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