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17-12-2015
Mathematics

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-0.8=0.13x−0.21x

What is X?

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taskmasters taskmasters

17-12-2015

x = 10

-0.80 = 0.13x - 0.21x
-0.80 = -0.08x
-0.80/ -0.08 = -0.08 x / -0.08
x = 10

If we convert these numbers into decimals, then

-0.80 * 100% = -80%
-0.08 * 100% = -8%

-80% ÷ -8% = 10 the negative signs cancel each other.

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