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6(65-x)+3.5x=340
We move all terms to the left:
6(65-x)+3.5x-(340)=0
We add all the numbers together, and all the variables
6(-1x+65)+3.5x-340=0
We add all the numbers together, and all the variables
3.5x+6(-1x+65)-340=0
We multiply parentheses
3.5x-6x+390-340=0
We add all the numbers together, and all the variables
-2.5x+50=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-50
x=-50/-2.5
x=+20
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