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5x+2x=+4=18
We move all terms to the left:
5x+2x-(+4)=0
We add all the numbers together, and all the variables
5x+2x-4=0
We add all the numbers together, and all the variables
7x-4=0
We move all terms containing x to the left, all other terms to the right
7x=4
x=4/7
x=4/7
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