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x*3+x=240
We move all terms to the left:
x*3+x-(240)=0
We add all the numbers together, and all the variables
x+x*3-240=0
Wy multiply elements
x+3x-240=0
We add all the numbers together, and all the variables
4x-240=0
We move all terms containing x to the left, all other terms to the right
4x=240
x=240/4
x=60
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