50 * (х: 16) = 40150 2700+у*400=170700 (12300-30) : k=30 (a+109) * 30=6510 d - (240*13) = 1260 n+1240=1060*20

1) 50 * (х: 16) = 40150.

х: 16 = 40150 : 50.

х: 16 = 803.

х = 803 * 16.

х = 12848.

2) 2700 + y * 400 = 170700.

y * 400 = 170700 - 2700.

y * 400 = 168000.

y = 168000 : 400/

y = 420.

3) (12300 - 30) : k = 30.

12270 : k = 30.

k = 12270 : 30.

k = 409.

4) (a + 109) * 30 = 6510.

a + 109 = 6510 : 30.

a + 109 = 217.

a = 217 - 109.

a = 108.

5) d - (240 * 13) = 1260.

d - 3120 = 1260.

d = 1260 + 3120.

d = 4380.

6) n + 1240 = 1060 * 20.

n + 1240 = 21200.

n = 21200 - 1240.

n = 19960.