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4x/7=21-3x
We move all terms to the left:
4x/7-(21-3x)=0
We add all the numbers together, and all the variables
4x/7-(-3x+21)=0
We get rid of parentheses
4x/7+3x-21=0
We multiply all the terms by the denominator
4x+3x*7-21*7=0
We add all the numbers together, and all the variables
4x+3x*7-147=0
Wy multiply elements
4x+21x-147=0
We add all the numbers together, and all the variables
25x-147=0
We move all terms containing x to the left, all other terms to the right
25x=147
x=147/25
x=5+22/25
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