x - 105 : 21 = 15
=> x - 5 = 15
=> x = 15 + 5
=> x = 20
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\(x-105:21=15\)
\(x-5=15\)
\(x=15+5\)
\(x=20\)
x - 105 : 21 = 15
<=> x - 5 = 15
<=> x = 20
X-105:21=15
X-105 =15.21
X-105 =315
X =315+105
=>X =420.
x - 105 : 21 = 15
x - 5 = 15
x = 15 + 5
x = 20
Vậy x = 20
\(x-105:21=15\)
\(\Rightarrow x-5=15\)
\(\Rightarrow x=15+5\)
\(\Rightarrow x=20\)
Vậy : x = 20