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3x+x/4=18
We move all terms to the left:
3x+x/4-(18)=0
We multiply all the terms by the denominator
3x*4+x-18*4=0
We add all the numbers together, and all the variables
x+3x*4-72=0
Wy multiply elements
x+12x-72=0
We add all the numbers together, and all the variables
13x-72=0
We move all terms containing x to the left, all other terms to the right
13x=72
x=72/13
x=5+7/13
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