Помогите пж срочно 40 баллов!!!

155.
1) 46+а+24+а=70+2а=2(35+а)

2) 25×9×b×4=900b

3) 57+b+43+b=100+2b= 2(50+b)

4) 96a+4a=100a

5) 89m-9m=80m
5n+9
6) 72n+28n=100n

156.
1) 6m+m-35=21
7m=21+35
7m=56
m= 56/7
m= 8
2) 17n+14n-145=134
31n=134+145
31n=279
n= 279/31
n=9
3) 5n+9n+32=200
14n=200-32
14n=168
n= 168/14
n=12
4) (x+57):7=12

$\frac{x + 57}{7} = 12 \\ \frac{x + 57}{7} \times 7 = 12 \times 7 \\ x + 57 = 84 \\ x = 84 - 57 \\ x = 27$
5) (161-y):16=9

$\frac{161 - y}{16} = 9 \\ \frac{161 - y}{16} \times 16 = 9 \times 16 \\ 161 - y = 144 \\ - y = 144 - 161 \\ - y = - 17 \\ y = 17$
6) 112:(17+x)=4
$\frac{112}{17 + x} = 4 \\ \frac{112}{17 + x} \times (17 + x) = 4 \times (17 + x) \\ 112 = 68 + 4x \\ 112 - 68 = 4x \\ 44 = 4x \\ 44 \div 4 = x \\ x = 11$