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0.69=35x+1.39x
We move all terms to the left:
0.69-(35x+1.39x)=0
We add all the numbers together, and all the variables
-(+36.39x)+0.69=0
We get rid of parentheses
-36.39x+0.69=0
We move all terms containing x to the left, all other terms to the right
-36.39x=-0.69
x=-0.69/-36.39
x=0.69/36.39
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