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0.15x+30=0.40x+5
We move all terms to the left:
0.15x+30-(0.40x+5)=0
We get rid of parentheses
0.15x-0.40x-5+30=0
We add all the numbers together, and all the variables
-0.25x+25=0
We move all terms containing x to the left, all other terms to the right
-0.25x=-25
x=-25/-0.25
x=+100
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