-15(x+2) + 7(2x3) = -50
-15(x+2) + 7 x 6 = -50
-15(x+2) + 42 = -50
-15(x+2) = -50 - 42
-15(x+2) = -92
(x+2) = -92 : -15
(x+2) = 6,1333
x = 6,1333 + 2
x = 8,1333
-15(x+2)+7(2.3)=-50
-15(x+2)+7.6=-50
-15(x+2)+42=-50
-15(x+2)=-50-42
-15(x+2)=-92
x+2=-92:-15
x+2=92/15
x=92/15-2
x=62/15
moi nguoi nho tk va ket ban voi minh nhe