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x in (-oo:+oo)
(-5/4)*(12*x-16) = -25 // + 25
(-5/4)*(12*x-16)+25 = 0
25-5/4*(12*x-16) = 0
25-5/4*(12*x-16) = 0
45-15*x = 0
45-15*x = 0
45-15*x = 0 // - 45
-15*x = -45 // : -15
x = -45/(-15)
x = 3
x = 3
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