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x+x*5+2=80
We move all terms to the left:
x+x*5+2-(80)=0
We add all the numbers together, and all the variables
x+x*5-78=0
Wy multiply elements
x+5x-78=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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