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1. 10q - 89 =
10q = 89
q = 8,9
2. (125-q):7=
125 : 7 = q
17,8 = q
3. (11q:4)+25=
4 + 25 =11q
29 = 11q
2,63 = q
4. (14q+80):30=
14q + 2,66 =
14q = -2,66
q = - 0,19