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50+40x=30+45x
We move all terms to the left:
50+40x-(30+45x)=0
We add all the numbers together, and all the variables
40x-(45x+30)+50=0
We get rid of parentheses
40x-45x-30+50=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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