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2(7+x)=9x
We move all terms to the left:
2(7+x)-(9x)=0
We add all the numbers together, and all the variables
2(x+7)-9x=0
We add all the numbers together, and all the variables
-9x+2(x+7)=0
We multiply parentheses
-9x+2x+14=0
We add all the numbers together, and all the variables
-7x+14=0
We move all terms containing x to the left, all other terms to the right
-7x=-14
x=-14/-7
x=+2
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