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(10*x)/21-(t/7) = 1 // - 1
(10*x)/21-(t/7)-1 = 0
10/21*x-1/7*t-1 = 0 // + -1/7*t-1
10/21*x = -(-1/7*t-1) // : 10/21
x = (-(-1/7*t-1))/10/21
x = 21/10*(1-(-1/7*t))
x = 21/10*(1-(-1/7*t))
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