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109+6x=123+4x
We move all terms to the left:
109+6x-(123+4x)=0
We add all the numbers together, and all the variables
6x-(4x+123)+109=0
We get rid of parentheses
6x-4x-123+109=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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