Question

Stiind ca a+b=6, determinati nr. X din 4•a+3•x+4•b=66

Answer 1

4a+3x+4b=66
4(a+b)=66-3x
24=66-3x
-42=-3x =>x=14

Answer 2

4*a+3*x+4*b=66
4*a+4*b+3*x=66
4*(a+b)+3*x=66
4*6+3*x=66
24+3*x=66
3*x=66-24
3*x=42
x=14