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x/7+3x=21
We move all terms to the left:
x/7+3x-(21)=0
We add all the numbers together, and all the variables
3x+x/7-21=0
We multiply all the terms by the denominator
3x*7+x-21*7=0
We add all the numbers together, and all the variables
x+3x*7-147=0
Wy multiply elements
x+21x-147=0
We add all the numbers together, and all the variables
22x-147=0
We move all terms containing x to the left, all other terms to the right
22x=147
x=147/22
x=6+15/22
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