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4x-45=2x-5
We move all terms to the left:
4x-45-(2x-5)=0
We get rid of parentheses
4x-2x+5-45=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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