x=3·3–1
5–2x=3
(1+x)/3=3
x=7–5
x=6/2
x=(5–3)/2
x+5=7
2x–3=5
7–x=1
x/3–1=2
x=(16–1)/3
3x=x+6
x=7–1
1+3x=16
x=(2+1)·3
x=(5+3)/2