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2x+3-18=7.5
We move all terms to the left:
2x+3-18-(7.5)=0
We add all the numbers together, and all the variables
2x-22.5=0
We move all terms containing x to the left, all other terms to the right
2x=22.5
x=22.5/2
x=11+0.5/2
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