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7x+(4x-2x)=4
We move all terms to the left:
7x+(4x-2x)-(4)=0
We add all the numbers together, and all the variables
7x+(+2x)-4=0
We get rid of parentheses
7x+2x-4=0
We add all the numbers together, and all the variables
9x-4=0
We move all terms containing x to the left, all other terms to the right
9x=4
x=4/9
x=4/9
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