Question

Stiind ca a+b=6, determinati numarul X din 4ori a +3 ori X +4ori b =66

Answer 1

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

Answer 2

$a+b=6 \\ X=? \\ 4a+3X+4b=66 \\ 4*(a+b)+3X=66 \\ 4*6+3X=66 \\ 24+3X=66 \\ 3X=66-24 \\ 3X=42 \\ X=42:3 \\ X\to\to\to14$