приведите подобные слагаемые
[tex]1)9 \frac{1}{9}a - 20c + \frac{1}{3} a + 18.1c[/tex]
[tex]2)6.5x - 7.1x - 19 + 8 \frac{1}{4} x[/tex]
[tex]3) - 1.6y + 2 \frac{3}{7} y - 3y + 2.6[/tex]
[tex]4) - 4 \frac{1}{6} z + 2 \frac{1}{3} c - 3c + 5.5z[/tex]


помогите пожалуйста
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