15011720222776
15011720233438
15011720235691
x+50+30=10+100 x+50+30=110 x+50=110-30 x+50=80 x=80-50 x=30
x + 50 + 30 - 100 = 10
x + (50 + 30 - 100) = 10
x + (80 - 100) = 10
x + (-)20 = 10
x = 10 + (-)20
x = 30
x = 10 + 100 - 30 - 50
--->x = 30
Vậy x =30
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