a: x=3*2/1=6
b: x=3/(-5)*(-2)=6/5
c: =>x+1=3/2
=>x=1/2
d: =>x+2=4
=>x=2
e: =>x+5=56/9
=>x=56/9-5=56/9-45/9=11/9
\(a,\dfrac{1}{2}=\dfrac{3}{x}\\ \dfrac{3}{6}=\dfrac{3}{x}\\ x=6\\ b,\dfrac{x}{-2}=\dfrac{3}{-5}\\\dfrac{\left(-5\right).x}{10}=\dfrac{-6}{10}\\ -5.x=-6\\ x=-6:\left(-5\right)\\ x=\dfrac{6}{5}\\ c,\dfrac{x+1}{2}=\dfrac{3}{4}\\ \dfrac{\left(x+1\right).2}{4}=\dfrac{3}{4}\\ \left(x+1\right).2=3\\ x+1=3:2\\ x+1=1,5\\ x=1,5-1\\ x=0,5\\ d,\dfrac{8}{x+5}=\dfrac{9}{7}\\ 8.7=9.\left(x+5\right)\\ 56=9.\left(x+5\right)\\ x+5=56:9\\ x+5=\dfrac{56}{9}\\ x=\dfrac{56}{9}-5\\ x=\dfrac{11}{9} \)
