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40(1.15)+x(.40)=(20)x+40
We move all terms to the left:
40(1.15)+x(.40)-((20)x+40)=0
We add all the numbers together, and all the variables
x(0.4)-(20x+40)+40(1.15)=0
We add all the numbers together, and all the variables
x(0.4)-(20x+40)+46=0
We multiply parentheses
0.4x-(20x+40)+46=0
We get rid of parentheses
0.4x-20x-40+46=0
We add all the numbers together, and all the variables
-19.6x+6=0
We move all terms containing x to the left, all other terms to the right
-19.6x=-6
x=-6/-19.6
x=6/19.6
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