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Jawab:
nilai x yang memenuhi
[tex]\sf x - \dfrac{7x-21}{5} = \dfrac{2x+6}{5} + 1[/tex]
kali (5)
5x - (7x - 21) = 2x + 6 + 5
5x - 7x + 21 = 2x + 11
-2x + 21 = 2x + 11
-2x - 2x = 11 - 21
-4x = -10
[tex]\sf x = \dfrac{-10}{-4} = \dfrac{5}{2}[/tex]
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