Question

stiind ca a+b=6, determinati numărul x din 4•a+3•x+4•b=66

Answer 1

[tex]4a+3x+4b=66\\ 4(a+b)+3x=66\\ 4*6+3x=66\\ 24+3x=66\\ 3x=42\\ x=42:3\\ x=14\\\\ Proba:4*6+14*3=66\\ 24+42=66\\ 66=66[/tex]

Answer 2

$a+b=6 \\ 4*a+3*x+4*b=66=\ \textgreater \ 4(a+b)+3*x=66=\ \textgreater \ \\ 4*6+3*x=66=\ \textgreater \ 3*x=66-24=42=\ \textgreater \ x= \frac{42}{3} =14 \\BlackBook$