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35x(4-7)=320
We move all terms to the left:
35x(4-7)-(320)=0
We add all the numbers together, and all the variables
35x(-3)-320=0
We multiply parentheses
-105x-320=0
We move all terms containing x to the left, all other terms to the right
-105x=320
x=320/-105
x=-3+1/21
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