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(3x+21)/7=8x-15
We move all terms to the left:
(3x+21)/7-(8x-15)=0
We get rid of parentheses
(3x+21)/7-8x+15=0
We multiply all the terms by the denominator
(3x+21)-8x*7+15*7=0
We add all the numbers together, and all the variables
(3x+21)-8x*7+105=0
Wy multiply elements
(3x+21)-56x+105=0
We get rid of parentheses
3x-56x+21+105=0
We add all the numbers together, and all the variables
-53x+126=0
We move all terms containing x to the left, all other terms to the right
-53x=-126
x=-126/-53
x=2+20/53
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