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2x-4+7x=54.5
We move all terms to the left:
2x-4+7x-(54.5)=0
We add all the numbers together, and all the variables
9x-58.5=0
We move all terms containing x to the left, all other terms to the right
9x=58.5
x=58.5/9
x=6+3/6
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