Question

I really need some help! How do I...solve this equation:

Answer 1

\[\frac{ x-21 }{ 7 }+\frac{ x+4 }{ 4 }=x-4\]

Answer 2

Multiply both sides for 28, then you have
4(x-21)+7(x+4)=28(x-4)
11x-56=28x-112
56=17x
x=56/17

Answer 3

Thank you!