21=36-x/30

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Solution for 21=36-x/30 equation: 


x in (-oo:+oo)

21 = 36-(x/30) // - 36-(x/30)

x/30-36+21 = 0

1/30*x-15 = 0 // + 15

1/30*x = 15 // : 1/30

x = 15/1/30

x = 450

x = 450

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