5y+3[7y+18]=106 8x+4[13x+32]=308 5[11x-31]-9x=121

Question

5y+3[7y+18]=106 8x+4[13x+32]=308 5[11x-31]-9x=121

Answer 1

1)5у+21у+54=106
5у+21у=106-54
26у=52
у=52:26
у=2
2)8х+52х+128=308
8х+52х=308-128
60х=180
х=180:60
х=3
3)55х-155-9х=121
55х-9х=121+155
46х=276
х=276:46
х=6