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x in (-oo:+oo)
(-1/2)*(5*x-9) = 19 // - 19
(-1/2)*(5*x-9)-19 = 0
-1/2*(5*x-9)-19 = 0
-1/2*(5*x-9)-19 = 0
-5/2*x-29/2 = 0
-5/2*x-29/2 = 0
-5/2*x-29/2 = 0 // + 29/2
-5/2*x = 29/2 // : -5/2
x = 29/2/(-5/2)
x = -29/5
x = -29/5
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