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x in (-oo:+oo)
2*((4/5)*x+(3/4)*y) = 150 // - 150
2*((4/5)*x+(3/4)*y)-150 = 0
2*(4/5*x+3/4*y)-150 = 0
2*(4/5*x+3/4*y)-150 = 0
8/5*x+3/2*y-150 = 0
8/5*x+3/2*y-150 = 0
8/5*x+3/2*y-150 = 0 // - 3/2*y-150
8/5*x = -(3/2*y-150) // : 8/5
x = (-(3/2*y-150))/8/5
x = 5/8*(150-(3/2*y))
x = 5/8*(150-(3/2*y))
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