\(\dfrac{1}{3}+\dfrac{2}{3}:x=-7\)
\(\dfrac{2}{3}:x=\left(-7\right)-\dfrac{1}{3}\)
\(\dfrac{2}{3}:x=-\dfrac{22}{3}\)
\(x=\dfrac{2}{3}:\left(-\dfrac{22}{3}\right)\)
\(x=-\dfrac{1}{11}\)
b) \(\dfrac{2}{3}:x=1,4-\dfrac{12}{5}\)
\(\dfrac{2}{3}:x=\dfrac{7}{5}-\dfrac{12}{5}\)
\(\dfrac{2}{3}:x=-1\)
\(x=\dfrac{2}{3}:\left(-1\right)\)
\(x=-\dfrac{2}{3}\)
c) \(\left(4,5-2x\right)\cdot1\dfrac{4}{7}=\dfrac{11}{14}\)
\(\left(\dfrac{9}{2}-2x\right)\cdot\dfrac{11}{7}=\dfrac{11}{14}\)
\(\dfrac{9}{2}-2x=\dfrac{11}{14}:\dfrac{11}{7}\)
\(\dfrac{9}{2}-2x=\dfrac{1}{2}\)
\(2x=\dfrac{9}{2}-\dfrac{1}{2}\)
\(2x=4\)
\(x=4:2\)
\(x=2\)
1/3 + 2/3 : x = 7
2/3 : x = 7 -1/3
2/3 : x = 20/3
x = 2/3 : 20/3
x = 1/10
2/3 : x = 1,4 -12/5
2/3 : x = 7/5 -12/5
2/3 : x = -1
x = 2/3 : -1
x = -2/3
(4,5 - 2x) x 1 4/7 = 11/14
(4,5 - 2x) x 11/7 = 11/14
(4,5 - 2x) = 11/14 : 11/7
(4,5 - 2x) = 1/2
2x = 4,5 - 1/2
2x =4
x = 4: 2
x = 2
