7(5+X)=-21X-1= berapakah hasil soal diatas?

7(5+x) = -21x – 1
35 + 7x = -21x – 1
35 + 1 =-21 – 7x
36 = -28x
36/28 = x
9/7 =x

jadi x = 9/7

Sorry klo salah

35 + 7x + 21x = -1
28 x = 34
x = 34/28
x=8/7