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170+0.4x=80+0.7x
We move all terms to the left:
170+0.4x-(80+0.7x)=0
We add all the numbers together, and all the variables
0.4x-(0.7x+80)+170=0
We get rid of parentheses
0.4x-0.7x-80+170=0
We add all the numbers together, and all the variables
-0.3x+90=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-90
x=-90/-0.3
x=+300
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