x + 20 = 50 + 50 + 50
x + 20 = 50 x 3
x + 20 = 150
=> x = 130.
x+20=3x50=150
x=150-20=130
x=130
thu lai 130+20 = 50+50+50=150
x + 20 = 50 + 50 + 50
x + 20 = 150
x = 150 - 20
x = 30
x + 20 = 50 + 50 + 50
x + 20 = 50 x 3
x + 20 = 150
x = 150 - 20
x = 130
\(x+20=50+50+50.\)
\(x+20=150\)
\(x=150-20\)
\(x=130\)
x+20=50+50+50
x+20=150
x=150:20
x=\(\frac{15}{2}\)
x+20=50+50+50
x+20=150
x=150-20
x=130
nhớ k mình nha