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2x-7=18-39
We move all terms to the left:
2x-7-(18-39)=0
We add all the numbers together, and all the variables
2x-7-(-21)=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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