Question

x+3/4-x/2=3
не x и снизу 3/4 а x+3 и снизу 4

Answer 1

$\frac{x+3}{4}-\frac{x}{2} =3\\\\\frac{x+3-2x}{4} =\frac{12}{4} \\\\\frac{-x+3}{4} =\frac{12}{4} \\-x+3=12\\-x=9\\x=-9$

Answer 2

$\frac{x+3}{4}-\frac{x}{2}=3 \\ x+3-2x=12 \\ -x+3=12 \\ -x=12-3 \\ -x=9 \\ x=-9$