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2.5(3x+9)-3(0.5x+4.5)=0
We multiply parentheses
7.5x-0x+22.5-13.5=0
We add all the numbers together, and all the variables
6.5x+9=0
We move all terms containing x to the left, all other terms to the right
6.5x=-9
x=-9/6.5
x=-1+1/2.6
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