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2x+4x-5=20-7
We move all terms to the left:
2x+4x-5-(20-7)=0
We add all the numbers together, and all the variables
2x+4x-5-13=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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