a)<=>3(x+3)=1(-15)
=>3x+9=-15
=>3x=-15-9
=>3x=-24
=>x=-8
b)<=>4,5-2x=\(\frac{11}{14}\div\frac{-11}{7}\)
\(\Rightarrow4\frac{1}{2}-2x=-\frac{1}{2}\)
\(\Leftrightarrow2x=\frac{9}{2}-\frac{-1}{2}\)
\(\Rightarrow2x=5\)
\(\Rightarrow x=\frac{5}{2}\)
a) <=> 3 (x + 3)
<=> x + 3 = -15
<=> x = -8(tm)