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(9/10)*y = 69/10-3*x // - 69/10-3*x
(9/10)*y-(-3*x)-(69/10) = 0
3*x+(9/10)*y-69/10 = 0
3*x+9/10*y-69/10 = 0 // - 9/10*y-69/10
3*x = -(9/10*y-69/10) // : 3
x = (-(9/10*y-69/10))/3
x = (69/10-(9/10*y))/3
x = (69/10-(9/10*y))/3
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