20=4/5(x-7)

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Solution for 20=4/5(x-7) equation: 


x in (-oo:+oo)

20 = (4/5)*(x-7) // - (4/5)*(x-7)

20-((4/5)*(x-7)) = 0

(-4/5)*(x-7)+20 = 0

20-4/5*(x-7) = 0

20-4/5*(x-7) = 0

128/5-4/5*x = 0

128/5-4/5*x = 0

128/5-4/5*x = 0 // - 128/5

-4/5*x = -128/5 // : -4/5

x = -128/5/(-4/5)

x = 32

x = 32

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