Question

решите уровнение пожалуйсто

84а+25а+7=443
4(9+7а)+21=393
486:(5х+2)=18

Answer 1

84а+25а+7=443
109a+7=443
109a = 436
a = 4

4(9+7а)+21=393
36+28a+21=393
57+28a = 393
28a = 336
a = 12

486:(5х+2)=18
97.2x+243=18
97.2x = -225
x = 2.3