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5x=9-3x=18+15
We move all terms to the left:
5x-(9-3x)=0
We add all the numbers together, and all the variables
5x-(-3x+9)=0
We get rid of parentheses
5x+3x-9=0
We add all the numbers together, and all the variables
8x-9=0
We move all terms containing x to the left, all other terms to the right
8x=9
x=9/8
x=1+1/8