Datrys ar gyfer x
x = \frac{7}{6} = 1\frac{1}{6} \approx 1.166666667
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2-x=\frac{1}{5+2}\left(7-x\right)
Tynnu 3 o 4 i gael 1.
2-x=\frac{1}{7}\left(7-x\right)
Adio 5 a 2 i gael 7.
2-x=\frac{1}{7}\times 7+\frac{1}{7}\left(-1\right)x
Defnyddio’r briodwedd ddosbarthu i luosi \frac{1}{7} â 7-x.
2-x=1+\frac{1}{7}\left(-1\right)x
Canslo 7 a 7.
2-x=1-\frac{1}{7}x
Lluosi \frac{1}{7} a -1 i gael -\frac{1}{7}.
2-x+\frac{1}{7}x=1
Ychwanegu \frac{1}{7}x at y ddwy ochr.
2-\frac{6}{7}x=1
Cyfuno -x a \frac{1}{7}x i gael -\frac{6}{7}x.
-\frac{6}{7}x=1-2
Tynnu 2 o'r ddwy ochr.
-\frac{6}{7}x=-1
Tynnu 2 o 1 i gael -1.
x=-\left(-\frac{7}{6}\right)
Lluoswch y ddwy ochr â -\frac{7}{6}, cilyddol -\frac{6}{7}.
x=\frac{7}{6}
Lluosi -1 a -\frac{7}{6} i gael \frac{7}{6}.
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