0
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8x + 5z - 4x + 3z + 6
= 8x - 4x + 5z + 3z - 6
= 4x + 8z - 6
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minus 1
7x2 -4x -5x2 +2x = 2x2 -2x
2x^3 - 3x^2 + 4x - 3
4x - 7 = 5 + 7x x = -4
3x + x = 4x