Penjelasan dengan langkah-langkah:
[tex]2a. \: 90 = 3x + 6x \\ 9x = 90 \\ x = 10 [/tex]
[tex]2b. \: 90 = 2y + y + 30 \\ 3y = 60 \\ y = 20[/tex]
[tex]2c. \: 90 = 70 + 5z - 5 \\ 5z = 25 \\ z = 5[/tex]
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Penjelasan dengan langkah-langkah:
[tex]2a. \: 90 = 3x + 6x \\ 9x = 90 \\ x = 10 [/tex]
[tex]2b. \: 90 = 2y + y + 30 \\ 3y = 60 \\ y = 20[/tex]
[tex]2c. \: 90 = 70 + 5z - 5 \\ 5z = 25 \\ z = 5[/tex]