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13-02-2018
Mathematics

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13-02-2018

91 + (10x - 4) + (8x + 3) = 180
91 - 4 + 3 + 10x + 8x = 180
90 + 18x = 180
18x = 180 - 90
18x = 90
x = 90/18 = 5

x is 5

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