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x+x+3(5x)+3(5x)=78
We move all terms to the left:
x+x+3(5x)+3(5x)-(78)=0
We add all the numbers together, and all the variables
72x-78=0
We move all terms containing x to the left, all other terms to the right
72x=78
x=78/72
x=1+1/12
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