помогите, пожалуйста.
2.упростите выражение
а) 4n-6n-3n+7+n
б)a+(a-8)-(12-a)
в)-4(c-5)+5(c+3)
3.упростите выражение 0,8(3x-14)-0,3(4-5x) при x=3 1/13​
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