0
Anonymous
x = 2
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(1, 1)
(-1, 5)
4x plus 7 plus 3x equals 19 plus xx = 2
(2, 7)
x2 + 3x + 7 = 5 ∴ x2 + 3x + 2 = 0 ∴ (x + 1)(x + 2) = 0 ∴ x ∈ {-2, -1}