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x/5+3=21-x
We move all terms to the left:
x/5+3-(21-x)=0
We add all the numbers together, and all the variables
x/5-(-1x+21)+3=0
We get rid of parentheses
x/5+1x-21+3=0
We multiply all the terms by the denominator
x+1x*5-21*5+3*5=0
We add all the numbers together, and all the variables
x+1x*5-90=0
Wy multiply elements
x+5x-90=0
We add all the numbers together, and all the variables
6x-90=0
We move all terms containing x to the left, all other terms to the right
6x=90
x=90/6
x=15
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