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2a=40-7
2a=33/:2
a=16,5
18 + 7a = 60
7a=60-18
7a=42/:7
a=6
4b - 9 = 31
4b=31+9
4b=40/:4
b=10
2a=33 /:2
a=16,5
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18 + 7a = 60 /-18
7a=42 /:7
a=6
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4b - 9 = 31 /+9
4b=40 /:4
b=10