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b) 9 + 4x - 1 = 8 + 4x
c) 4x - 8x + 12 = -4x + 12
d) 7 - 2x - x + 5 = 12 - 3x
e) 3x^2 + 3y^2 - 5xy + 2x^2 - 5y^2 + 6xy = 5x^2 - 2y^2 + xy
b. 9-1 +4X = 8+4x = 12x
c. -4x+12= -8x
d. 2x-x = 5-7
x = -2
e. 5x -2y xy