23+7=30
30:5=6
35:5=7
3*4=12
30-12=18
6+18=24
Решим данное ур-не
4x+8x=204
12х=204
х=204:12
х=17
Ур-не решено.
50 – 33 = (40 + 10) – 33 = (40 – 33) + 10 = 7+10 = 17
50 – 35 = (40 + 10) – 35 = (40 – 35) + 10=5+10 = 15
50 – 19 = (20 + 30) – 19 = (20 – 19) +30= 1+30 = 31
50 – 24 = (30 + 20) – 24 = (30 – 24) + 10 = 6+20 = 26
50 – 12 = (20 + 30) – 12 = (20 – 12) + 30 = 8+30 = 38
8а-68=57+3а
8а-3а=57+68
5а=115
а=115:5
а=23