(3x-8)-(7x+1)=21 ; 5-7x=11x-3(x+5)

Question

(3x-8)-(7x+1)=21 ; 5-7x=11x-3(x+5)

Answer 1

3х -8 -7х -1=21
-4х=21+8+1
-4х=30
х= - 7,5

5 - 7х= 11х -3х -15
-7х -11х+3х=-15-5
-15х=10
х=2/3