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2x/10+5x/10=70
We move all terms to the left:
2x/10+5x/10-(70)=0
We multiply all the terms by the denominator
2x+5x-70*10=0
We add all the numbers together, and all the variables
7x-700=0
We move all terms containing x to the left, all other terms to the right
7x=700
x=700/7
x=100
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