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x in (-oo:+oo)
(5/4)*x-(7/4) = -12 // + 12
(5/4)*x-(7/4)+12 = 0
(5/4)*x-7/4+12 = 0
5/4*x+41/4 = 0 // - 41/4
5/4*x = -41/4 // : 5/4
x = -41/4/5/4
x = -41/5
x = -41/5
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