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21(x+1)=10(2x-4)
21x+21=20x-40
x=-61
3(x+1) : 2 = 5(2x-4)
3x + 3 = 10x - 20
3x - 10x = -20 + 3
-7x = 17
x = -61
Jadi, jawabannya C = X=-61