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Anonymous
Add 12 to each side: 4x + 6x = 20 ie 10x = 20 so x = 2
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6x + 8 = 13, 6x = 13 - 8, 6x = 5, x = 5/6
y=6x-16 y=-2x+8
(4, 8)
x=7
x2 + 6x + 8 = 0 Solve for x.X = -2 or X = -4