Question

х+(х+8)=11 ???????,???

Answer 1

$x + (x + 8) = 11 \\ x + x + 8 = 11 \\ 2 = 11 - 8 \\ 2x = 3 \\ x = 3 \div 2 \\ x = 1.5$

Answer 2

$x+(x+8)=11 \\x+x+8=11 \\2x+8=11 \\2x=11-8 \\2x=3 \\x=1 \frac{1}{2}=1.5$