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(1/4)*y-(7*x)-(15/2) = 0
(1/4)*y-7*x-15/2 = 0
1/4*y-7*x-15/2 = 0 // - 1/4*y-15/2
-7*x = -(1/4*y-15/2) // : -7
x = (-(1/4*y-15/2))/(-7)
x = (15/2-(1/4*y))/(-7)
x = (15/2-(1/4*y))/(-7)
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