1.Упростите выражение: а) 5а+7б-2а-8б;     б) 3(4х+2)-5;     в) 20б-(б-3)+(3б-10).
2.
Упростите выражение и найдите его значение:
-6(0,5х-1,5)-4,5х-8 при х= 
[tex] \frac{2}{3} [/tex]
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