помогите решить уравнения 15*(a + 2) = 6 * (2a+7)
12b - 7 * (b + 4) = 26 - 4b
5 * (3c + 2) = 8 * (9 - 2c)
10k + 2 * (7k - 2 ) = 5 * ( 4k + 3 ) + 3k
12b - 7 * (b + 4) = 26 - 4b
5 * (3c + 2) = 8 * (9 - 2c)
10k + 2 * (7k - 2 ) = 5 * ( 4k + 3 ) + 3k
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1) 15*(a+2)= 6*(2a+7)15a+30=12a+42
15a-12a=42-30
3a= 12
a=4
2) 12b-7*(b+4)= 26- 4b
12b-7b-28= 26-4b
5b+4b=26+28
9b= 54
b= 6
3) 5 * (3c + 2) = 8 * (9 - 2c)
15c+10= 72-16c
15c+16c= 72-10
31c=62
c=2
4)10k + 2 * (7k - 2 ) = 5 * ( 4k + 3 ) + 3k
10k+ 14k-4=20k+15+3k
24k-4=23k+15
24k-23k=15+4
1k=19
k= 19:1
k=19