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(75+30)*x=400+30x
We move all terms to the left:
(75+30)*x-(400+30x)=0
We add all the numbers together, and all the variables
105*x-(30x+400)=0
We add all the numbers together, and all the variables
105x-(30x+400)=0
We get rid of parentheses
105x-30x-400=0
We add all the numbers together, and all the variables
75x-400=0
We move all terms containing x to the left, all other terms to the right
75x=400
x=400/75
x=5+1/3
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