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2x+51=105-4x
We move all terms to the left:
2x+51-(105-4x)=0
We add all the numbers together, and all the variables
2x-(-4x+105)+51=0
We get rid of parentheses
2x+4x-105+51=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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