X/3.9=8.1/7.2

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Solution for X/3.9=8.1/7.2 equation: 


X in (-oo:+oo)

X/3.9 = 8.1/7.2 // - 8.1/7.2

X/3.9-(8.1/7.2) = 0

X/3.9-1.125 = 0

0.25641026*X-1.125 = 0 // + 1.125

0.25641026*X = 1.125 // : 0.25641026

X = 1.125/0.25641026

X = 4.38749994

X = 4.38749994

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