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3x+9=7x/2
We move all terms to the left:
3x+9-(7x/2)=0
We add all the numbers together, and all the variables
3x-(+7x/2)+9=0
We get rid of parentheses
3x-7x/2+9=0
We multiply all the terms by the denominator
3x*2-7x+9*2=0
We add all the numbers together, and all the variables
-7x+3x*2+18=0
Wy multiply elements
-7x+6x+18=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18
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