10x + 2y + 8z - 5x + 4z - 4y
= 10x - 5x + 2y - 4y + 8z + 4z
= (10 - 5)x + (2 - 4)y + (8 + 4)z
= 5x - 2y + 12z
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x + 13x + 10x = 50 - 6
x2 + 10x + 21 = (x + 3)(x + 7)
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
6-x+12 = 10x+7 6+12-7 = 10x+x 11 = 11x x = 1
x=-1.6