РЕБЯЯЯЯТ,ПОМОГИТЕ РЕШИТЬ!!1!!1! ОЧЕНЬ НАДО, БУДУ БЛАГОДАРНА

Упростите выражение:
1) -2.8а-(-5b)
2) -12а-25b +18a+14b
3)b-(b+6)+(b-18)
4) -7(m-4)+5(m+2)
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