-5/8=21x/40

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Solution for -5/8=21x/40 equation: 


x in (-oo:+oo)

-5/8 = (21*x)/40 // - (21*x)/40

-((21*x)/40)-5/8 = 0

(-21/40)*x-5/8 = 0

-21/40*x-5/8 = 0 // + 5/8

-21/40*x = 5/8 // : -21/40

x = 5/8/(-21/40)

x = -25/21

x = -25/21

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