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70x+140=7x+5
We move all terms to the left:
70x+140-(7x+5)=0
We get rid of parentheses
70x-7x-5+140=0
We add all the numbers together, and all the variables
63x+135=0
We move all terms containing x to the left, all other terms to the right
63x=-135
x=-135/63
x=-2+1/7
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