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3x+4=-7+2.x
We move all terms to the left:
3x+4-(-7+2.x)=0
We add all the numbers together, and all the variables
3x-(2.x-7)+4=0
We get rid of parentheses
3x-2.x+7+4=0
We add all the numbers together, and all the variables
x+11=0
We move all terms containing x to the left, all other terms to the right
x=-11
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