(1)(90-x)(.9)=(4)(25-x)(4.184)

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Solution for (1)(90-x)(.9)=(4)(25-x)(4.184) equation:



(1)(90-x)(.9)=(4)(25-x)(4.184)
We move all terms to the left:
(1)(90-x)(.9)-((4)(25-x)(4.184))=0
We add all the numbers together, and all the variables
1(-1x+90)(0.9)-(4(-1x+25)(4.184))=0
We multiply parentheses ..
1(-0.9x+81)-(4(-1x+25)(4.184))=0
We calculate terms in parentheses: -(4(-1x+25)(4.184)), so:
4(-1x+25)(4.184)
We multiply parentheses ..
4(-4.184x+104.6)
We multiply parentheses
-16x+418.4
Back to the equation:
-(-16x+418.4)
We get rid of parentheses
1(-0.9x+81)+16x-418.4=0
We add all the numbers together, and all the variables
16x+1(-0.9x+81)-418.4=0
We move all terms containing x to the left, all other terms to the right
16x+1(-0.9x+81)=418.4

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