13/39 = x
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8x-4 = -7+5x 8x-5x = -7+4 3x = -3 x = -1
8x + 6 = 3x - 4 8x = 3x - 4 - 6 8x = 3x - 10 8x - 3x = -10 5x = -10 5x/5 = -10 x = -10/5 x = -2
(5x 2 - 8x + 1) + (2x 2 - 4x - 11)
3x+y=-1 y=-1-3x5x-y=9 5x-(-1-3x)=95x+1+3x=98x=8x=1y=-1-3(1)y=-4(1,-4)
3x = 7-5x 8x=7 x = 7/8 x = 0.875