у+3=160:20
у+3=8
у=5
2)216:(16-x)=18
16-х=216:18
16-х=12
х=4
3)8х+91=21*7
8х=147-91
х=56:8
х=7
4)5у+21у+54=106
26у=106-54
у=52:26
у=2
5)8x+4(13x+32)=308
8x+52x+128=308
60x=308-128
60x=180
x=180/60
x=3
6)5(11x-31)-9x=121
55x-155-9x-121=0
46x-276=0
x=276/46
x=6
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Answers & Comments
у+3=160:20
у+3=8
у=5
2)216:(16-x)=18
16-х=216:18
16-х=12
х=4
3)8х+91=21*7
8х=147-91
х=56:8
х=7
4)5у+21у+54=106
26у=106-54
у=52:26
у=2
5)8x+4(13x+32)=308
8x+52x+128=308
60x=308-128
60x=180
x=180/60
x=3
6)5(11x-31)-9x=121
55x-155-9x-121=0
46x-276=0
x=276/46
x=6