Помогите пожалуйста!ОЧЕНЬ НАДО!15 БАЛЛОВ

Упростите:
а)3x-5x-4+12x+7
б)2*(5а-4)-6*(4а+3)-(а-18)
в)[tex]\frac56 \\ [/tex]*(2.4x+[tex] \frac{6}{35} \\ [/tex]y)-1.2*([tex] \frac{2}{3} [/tex]x-[tex] \frac{5}{7} } [/tex]y)



















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