Спростіть вирази
1) -6(2a-7)+4(-5-6)
2) 7a(3 - c) + c(4a + 5) + (-2c - Зас)
3) 8a-4b + 3ас - a + 2b - 5а
4) -2(-4b-7)+(b-3)
ПОМОГИТЕ СРОЧНОО​
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