-13 - 3x = -10
-13 + 10 = 3x
-3 = 3x
x = -3 : 3 = -1
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Answer:
Step-by-step explanation:
Total marbles=120
sum of ratio=2+3+7=12
Red=2/12 ×120=20
yellow=3/12×120=30
Green =7/12×120=70