t/21=40/28

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Solution for t/21=40/28 equation: 


t in (-oo:+oo)

t/21 = 40/28 // - 40/28

t/21-(40/28) = 0

t/21-10/7 = 0

1/21*t-10/7 = 0 // + 10/7

1/21*t = 10/7 // : 1/21

t = 10/7/1/21

t = 30

t = 30

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