а)15x-8x=21 б) 2x+4x=30 в)4y+2y-y=20
а)15x-8x=21
7х=21 | :7
х=3
б) 2x+4x=30
6х=30 | :6
x=5
в)4y+2y-y=20
5y=20 | :5
y=4
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а)15x-8x=21
7х=21 | :7
х=3
б) 2x+4x=30
6х=30 | :6
x=5
в)4y+2y-y=20
5y=20 | :5
y=4