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Sep 5, 2018
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Mathematics
high-school
Mithra Singam
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3x+6x=90
9x=90
x=10
...................
Ernest
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Sep 7, 2018
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Ernest
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4
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two complementary angles make a total of 90, so 3x+6x=90, x=10
Chester Cobus
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Sep 11, 2018
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Chester Cobus
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