The number is -14/23 or -0.6087. Let x = the number Equation: 1/2 * x = 12 * x + 7 multiplying the equation by 2 2(1/2x) = (12x + 7)2 x = 24x + 14 x - 24x = 14 -23x = 14 x = -14/23 or -0.6087 check: 1/2 * x = 12 * x + 7 1/2 (-14/23) = 12 (-14/23) + 7 -14/46 = -168/23 + 161/23 -7/23 = -7/23