Question

Qual o valor dessa equação ? 28+X  =  (14+X)+(7+(X/2)

Answer 1

$28 +x = (14 +x) +(7 +( \frac{x}{2})) \\ \\ 28 +x = (14 +x) + (\dfrac{x + 14}{2}) \\ \\ \\ 28 +x =(\dfrac{28 + 2x + x + 14}{2}) \\ \\ \\ 28 +x =(\dfrac{28 + 3x + 14}{2}) \\ \\ \\ 28 +x =(\dfrac{3x + 42}{2})\\ \\ \\ 28 +x \dfrac{-3x - 42}{2}=0 \\ \\ \\ \dfrac{28x - 3x - 42}{2}=0 \\ \\ \\ 56 +2x - 3x - 42 = 0 \\ \\ -x = -56 + 42 * (-1) \\ \\ x = -56 + 42 \\ \\ =>x=-14$