помогите решить (5х+8) /3 + (11x -1)/6= -1.2 уравнение...(4х+9)/5 - (4+3х)/2

(5х+8) /3 + (11х-1) /6 = -1
2(5х+8)  /3 + 11х-1 /6 = -1
10х+16  /6 + 11х-1 /6 = -1
21х+15 /6 = -1
21х+15=-1 *6
21х+15= -6
21х=-6-15
21х=-21
х=-1
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(4х+9) /5 - (4+3х) /2 =4
2 (4х+9) /10 - 5(4+3х) /2 =4
8х+18 /10 - 20-15х /10 =4
-7х-2 /10=4
-7х-2=4*10
-7х-2=40
-7х=40+2
-7х=42
х=42/ (-7)
х=-6