Question

X+2x+5x-12=28; 4,7y-(2,5y-49)=115 решите уравнения

Answer 1

1) х+2х+5х-12=28
8х=40
х=5

2) 4,7у-(2,5у-49)=115
4.7у-2.5у+49=115
2.2у=66
1.1у=33
11у=330
у=30