7x + 8 = 10x - 2
∴ 3x = 10
∴ x = 10/3
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7x = 3 x = 3/7
3x - 2y + 7x + 4y = 3x + 7x - 2y +4y = (3+7)x + (-2+4)y = 10x + 2y
(x2 + 7x - 18) = (x + 9)(x - 2)
7x = 5+5x 7x-5x = 5 2x = 5 x = 2.5
2x2 + 7x - 15 = 02x2 + 10x - 3x - 15 = 0(2x2 - 3x) + (10x - 15) = 0x(2x - 3) + 5(2x - 3) = 0(2x - 3)(x + 5) = 0(2x - 3) = 0 or (x + 5) = 0x = 3/2 or x = -5