a 7x + 8 = 57
7x= 57-8
7x = 49
x = 7
b 8x+x=720
9х=720
x= 720÷9
x= 80
с (90-у) ÷6 = 8
90-у=48
-у=48-90
-у= -42
у= 42
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Answers & Comments
a 7x + 8 = 57
7x= 57-8
7x = 49
x = 7
b 8x+x=720
9х=720
x= 720÷9
x= 80
с (90-у) ÷6 = 8
90-у=48
-у=48-90
-у= -42
у= 42