5x + 15 = 10
<=> 5(x+3) = 5.2
<=> x+3 =2
<=> x = 2-3
<=> x = -1
Vậy x = -1 thì thỏa 5x + 15 = 10
\(5x+15=10\)
\(\Rightarrow5.\left(x+3\right)=5.2\)
\(\Rightarrow x+3=2\)
\(\Rightarrow x=2-3\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
Chúc bạn học tốt !!!
5x + 15 = 10
5x = 10 - 15 = -5
x = -5 : 5
x = -1
Tìm x biết :
5x + 15 = 10
5x = -10-15= -5
=> x= -1
5x + 15 = 10
5x = 10 - 15
5x = -5
x = ( -5 ) : 5
x = -1
\(5x+15=10\)
\(5x=10-15\)
\(5x=-5\)
\(x=\left(-5\right)\div5\)
\(x=-1\)