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(1/3)*x-(4*y) = 18 // - 18
(1/3)*x-(4*y)-18 = 0
(1/3)*x-4*y-18 = 0
1/3*x-4*y-18 = 0 // + -4*y-18
1/3*x = -(-4*y-18) // : 1/3
x = (-(-4*y-18))/1/3
x = 3*(18-(-4*y))
x = 3*(18-(-4*y))
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