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x in (-oo:+oo)
(4/7)*x-(2/7) = -12 // + 12
(4/7)*x-(2/7)+12 = 0
(4/7)*x-2/7+12 = 0
4/7*x+82/7 = 0 // - 82/7
4/7*x = -82/7 // : 4/7
x = -82/7/4/7
x = -41/2
x = -41/2
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