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(4*0.9)x-0.1x=500
We move all terms to the left:
(4*0.9)x-0.1x-(500)=0
We add all the numbers together, and all the variables
(3.6)x-0.1x-500=0
We add all the numbers together, and all the variables
-0.1x+(3.6)x-500=0
We multiply parentheses
-0.1x+3.6x-500=0
We add all the numbers together, and all the variables
3.5x-500=0
We move all terms containing x to the left, all other terms to the right
3.5x=500
x=500/3.5
x=142+1/1.16666666667
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