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2x-5x=-14-7
We move all terms to the left:
2x-5x-(-14-7)=0
We add all the numbers together, and all the variables
2x-5x-(-21)=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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