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(2x+21)/5=3
We move all terms to the left:
(2x+21)/5-(3)=0
We multiply all the terms by the denominator
(2x+21)-3*5=0
We add all the numbers together, and all the variables
(2x+21)-15=0
We get rid of parentheses
2x+21-15=0
We add all the numbers together, and all the variables
2x+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3
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