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x in (-oo:+oo)
(1/4)*x = (1/2)*t-9 // - (1/2)*t-9
(1/4)*x-((1/2)*t)+9 = 0
(-1/2)*t+(1/4)*x+9 = 0
1/4*x-1/2*t+9 = 0 // - 9-1/2*t
1/4*x = -(9-1/2*t) // : 1/4
x = (-(9-1/2*t))/1/4
x = -4*(9-1/2*t)
x = -4*(9-1/2*t)
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