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50=4x+3x=74
We move all terms to the left:
50-(4x+3x)=0
We add all the numbers together, and all the variables
-(+7x)+50=0
We get rid of parentheses
-7x+50=0
We move all terms containing x to the left, all other terms to the right
-7x=-50
x=-50/-7
x=7+1/7
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