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49=7x-51-2x
We move all terms to the left:
49-(7x-51-2x)=0
We add all the numbers together, and all the variables
-(5x-51)+49=0
We get rid of parentheses
-5x+51+49=0
We add all the numbers together, and all the variables
-5x+100=0
We move all terms containing x to the left, all other terms to the right
-5x=-100
x=-100/-5
x=+20
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