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x = 13
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If: 4x = x+15 Then: x = 5
x+15=16x=16-15x=1
x=2 1/7
x2 + 2x - 15 = 0(x + 5) (x - 3) = 0x = -5x = +3
x-y = 6 -x-3y = 22 -4y = 28 y = -7 So by substituting: x = -1 and y = -7