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50+4x=20+5x.x=
We move all terms to the left:
50+4x-(20+5x.x)=0
We add all the numbers together, and all the variables
4x-(5x.x+20)+50=0
We get rid of parentheses
4x-5x.x-20+50=0
We add all the numbers together, and all the variables
4x-5x.x+30=0
We move all terms containing x to the left, all other terms to the right
4x-5x.x=-30
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