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x in (-oo:+oo)
(1/7)*x-2.4 = -8.7 // + 8.7
(1/7)*x-2.4+8.7 = 0
1/7*x+6.3 = 0 // - 6.3
1/7*x = -6.3 // : 1/7
x = -6.3/1/7
x = -44.10000088
x = -44.10000088
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