1) 4x+0,5=5⇔4x=5-0,5⇔4x=4,5⇔x=1,125
2) 4,5x+2=0,5⇔4,5x=-1,5⇔x=-1/3
3) 3x+1=0⇔3x=-1⇔x=-1/3
4) x=12/3 ⇔x=4
5) x=-1/3
6) x=1-2⇔x=-1
7) x=0,5+4⇔x=4,5
8) (4/3)·x=5 |·3⇔4x=15⇔x=15/4
9) (5/6)·y=1 |·6⇔5y=6⇔y=6/5
10) -1=(2/3)·t |·3⇔-3=2t⇔t=-3/2
11) -(4/7)·y=8 |·7⇔-4y=56⇔y=-14
12) (2/3)·x+3/3=5/3 |·3⇔2x+3=5⇔2x=2⇔x=1