решите уравнение 7)2/3x=18
8)3/4x=27
9)2/7x=0
10)3x+7=0
11)3x+7=0
12)13-100=0
13)0.5x+0.15=0
14) 8-0.8x=0
15)7x-4=x-16
16)13-5x=8-2x
17)4y+15=6y+17
18)1.5p-11=0.8p+5
19)0.71x13=10-0.29x
20)8c+0.73=4.61-8c
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