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(4 + 2x) - (-2x + 1) = 13 + 6 4 + 2x + 2x -1 = 19 4x +3 = 19 4x = 19 - 3 4x = 16 therefore x = 16/4 x = 4
-2x+16 = 0 -2x = -16 x = 8
(-2x2 + x + 1) / (x - 1) = (-2x - 1)(x - 1)/(x - 1) = -2x - 1
x=3
16 + 2x = 10 + 8xSubtract 2x from each side:16 = 10 + 6xSubtract 10 from each side:6 = 6xDivide each side by 6:1 = x