32х=420-100
42:х=63-57
с проверкой
32x=320
x=320 : 32
x=10
32 х 10 = 420 -100
320=320
42 : х = 6
х = 42 : 6
х = 7
42 : 7 = 63 -57
6 = 6
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32х=420-100
32x=320
x=320 : 32
x=10
32 х 10 = 420 -100
320=320
42:х=63-57
42 : х = 6
х = 42 : 6
х = 7
42 : 7 = 63 -57
6 = 6