Question

Ex 9
Va rooggggggggg

Answer 1

{3×[12+(6+2x+3y):5]-9}:6+15=21
{3×[12+(6+2x+3y):5]-9}:6=21-15
{3×[12+(6+2x+3y):5]-9}:6=6
3×[12+(6+2x+2y):5]-9=6×6
3×[12+(6+2x+3y):5]-9=36
3×[12+(6+2x+3y):5]=36+9
3×[12+(6+2x+3y):5]=45
12+(6+2x+3y):5=45:3
12+(6+2x+3y):5=15
(6+2x+3y):5=15-12
(6+2x+3y):5=3
6+2x+3y=3×5
6+2x+3y=15
2x+3y=15-6
2x+3y=9

x=0 si y=3 》2×0+3×3=0+9=9

x=3 si y=1 》2×3+3×1=6+3=9