Răspuns:
Explicație pas cu pas:
a) x+3=a x=1,5 a=1,5+3=4,5
b)a=x/2-1=2/3×1/2-1=1/3-1(1-3).=-2/3
c)a=2/3×3/5-1/2=2/5-1/2=(4-5)/10=-1/10=-0,1
d)x/5-1/5=2a/3 10/3×1/5-1/5=1/5(10/3-1)=(10-3)/15=-7/15
-7/15=2a/3 -7/5=2a a=-7/10=-0,7