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(3x)(4x)(5x)=7.5
We move all terms to the left:
(3x)(4x)(5x)-(7.5)=0
We add all the numbers together, and all the variables
3x4x5x-7.5=0
We move all terms containing x to the left, all other terms to the right
3x4x5x=7.5
x=7.5/1
x=7.5
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