Tìm x:
a) x + 15 = 20 b) x – 18 = 16 c) 72 – x = 50
d) \(x \times 7 = 42\) e) x : 7 = 5 g) 49 : x = 7
a) x + 15 = 20
x = 20 – 15
x = 5
b) x – 18 = 16
x = 16 + 18
x = 34
c) 72 – x = 50
x = 72 – 50
x = 22
d) x ⨯ 7 = 42
x = 42 : 7
x = 6
e) x : 7 = 5
x = 5 ⨯ 7
x = 35
g) 49 : x = 7
x = 49 : 7
x = 7
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