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3x/7+x=30
We move all terms to the left:
3x/7+x-(30)=0
We add all the numbers together, and all the variables
x+3x/7-30=0
We multiply all the terms by the denominator
x*7+3x-30*7=0
We add all the numbers together, and all the variables
3x+x*7-210=0
Wy multiply elements
3x+7x-210=0
We add all the numbers together, and all the variables
10x-210=0
We move all terms containing x to the left, all other terms to the right
10x=210
x=210/10
x=21
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