Question

Stiind ca a+b=6 , determinati numarul x din 4*a +3*x + 4*b=66

Answer 1

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

Answer 2

a+b=6/*4
4a+4b=24
4*a+3*x+4*b=66/-
4a+4b=24
3*x=42
x=42:3
x=14