solvefor x,7x+4y=1

解答

求解

x, 7 x + 4 y = 1

x = \frac{1 - 4 y}{7}

求解步骤

7 x + 4 y = 1

将

4 y

到右边

7 x = 1 - 4 y

两边除以

7

x = \frac{1 - 4 y}{7}

\frac{1}{3} k + 80 = \frac{1}{2} k + 120

8 x + 18 = 90

\frac{5 x - 7}{2} - \frac{2 x + 7}{3} = 3 x - 14

so l v e f or x, x + 2 y + 3 = 0

x^{2} + 5 = (x - 1) (x - 3)