5 x + 13 sobre 10 = 21 sub 30
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5x + 13 = 21
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10 30
5x + 13 = 21.10 (:10)
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30 (:10)
5x + 13 = 21.1
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3
5x + 13 = 7.1
5x + 13 = 7
5x = 7 - 13
5x = - 6
x = - 6
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5
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10 30
5x + 13 = 21.10 (:10)
------
30 (:10)
5x + 13 = 21.1
----
3
5x + 13 = 7.1
5x + 13 = 7
5x = 7 - 13
5x = - 6
x = - 6
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5
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