(1)(2.9-1.4)x=60 (3)7.8--10x=2.8 (4)x--3.2=11.5/0.5
0.5x= 60 10x=7.8--2.8 x--3.2=23
x=60/0.5 10x=5 x=23+3.2
x=40 x=5/10 x=26.2
x=0.5