7 × a - 11 = 31
7 × a = 31 + 11
7 × a = 42
a = 42 : 7
a = 6
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6 × b - 10 = 26
6 × b = 26 + 10
6 × b = 36
b = 36 : 6
b = 6
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24 + 8 × c = 64
8 × c = 64 - 24
8 × c = 40
c = 40 : 8
c = 5
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18 : d + 3 = 12
18 : d = 12 - 3
18 : d = 9
d = 18 : 9
d = 2
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e : 10 + 35 = 41
e : 10 = 41 - 35
e : 10 = 6
e = 6 × 10
e = 60
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32 - f : 4 = 7 × 4
32 - f : 4 = 28
f : 4 = 32 - 28
f : 4 = 4
f = 4 × 4
f = 16