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-9y + 8 = -91-9y = -91 -8-9y = -99y = -99-----9y = 11-99/-9 = 11 because -9X11 = -99
5x-4y+9y+x-9+7 = 5x + x - 4y + 9y - 9 + 7 = 6x + 5y - 2 ■
9Y^4 * Y^5 add exponents and coefficients multiplied 9Y^9
-9y-15x ---- -3
9y - 4x