4/3 (15-21x)+x=74

解答

\frac{4}{3} (15 - 21 x) + x = 74

x = - 2

求解步骤

\frac{4}{3} (15 - 21 x) + x = 74

乘

\frac{4}{3} (15 - 21 x) : \frac{4 ( - 21 x + 15 )}{3}

\frac{4 ( 15 - 21 x )}{3} + x = 74

在两边乘以

3

4 (15 - 21 x) + 3 x = 222

乘开

4 (15 - 21 x) : 60 - 84 x

60 - 84 x + 3 x = 222

so l v e f or x, 3 x + 2 y - z = 8

so l v e f or C, S = C + RC

x + 6 = - 4

so l v e f or R, P = I^{2} R

16 x - 3 (4 x + 7) = 6 x - (2 x + 21)