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(7/5)*m+3 = 7*x-18 // - 7*x-18
(7/5)*m-(7*x)+3+18 = 0
(7/5)*m-7*x+3+18 = 0
7/5*m-7*x+21 = 0 // - 7/5*m+21
-7*x = -(7/5*m+21) // : -7
x = (-(7/5*m+21))/(-7)
x = (7/5*m+21)/7
x = (7/5*m+21)/7
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