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6x-13x=71-51
We move all terms to the left:
6x-13x-(71-51)=0
We add all the numbers together, and all the variables
6x-13x-20=0
We add all the numbers together, and all the variables
-7x-20=0
We move all terms containing x to the left, all other terms to the right
-7x=20
x=20/-7
x=-2+6/7
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