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75+25x=30+40x
We move all terms to the left:
75+25x-(30+40x)=0
We add all the numbers together, and all the variables
25x-(40x+30)+75=0
We get rid of parentheses
25x-40x-30+75=0
We add all the numbers together, and all the variables
-15x+45=0
We move all terms containing x to the left, all other terms to the right
-15x=-45
x=-45/-15
x=+3
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