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7*y = (4*x)/5+4 // - (4*x)/5+4
7*y-((4*x)/5)-4 = 0
(-4/5)*x+7*y-4 = 0
7*y-4/5*x-4 = 0 // - 7*y-4
-4/5*x = -(7*y-4) // : -4/5
x = (-(7*y-4))/(-4/5)
x = -5/4*(4-(7*y))
x = -5/4*(4-(7*y))
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