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230*0.25*x+30=0.4x
We move all terms to the left:
230*0.25*x+30-(0.4x)=0
We add all the numbers together, and all the variables
230*0.25*x-(+0.4x)+30=0
Wy multiply elements
57.5x-(+0.4x)+30=0
We get rid of parentheses
57.5x-0.4x+30=0
We add all the numbers together, and all the variables
57.1x+30=0
We move all terms containing x to the left, all other terms to the right
57.1x=-30
x=-30/57.1
x=-10/19.033333333333
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