................................................................
0.3х+8=2
0.3х=2-8
0.3х=-6
х=-6:0.3
х=-20
проверка
0.3*-20+8=-6+8=2 верно
12 1/3 - 7 3/4 = 12 4/12 - 7 9/12 = 11 16/12 - 7 9/12 = 4 7/12
1м=10дм 1дм=1см
6м25см+1.7м8см=7.7м 38см=3дм и 8см= 7.7м3.8дм