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b) -(3a) + (8 - 7a - 8b) - 20 =-3a+8-7a-8b-20=-10a-8b-14
c) (1,5m + 0,7n - 1) + (4m + n - 5) = 1,5m+0,7n-1+4m+n-5=5,5m+1,7n-6
d) (a+b+c) - (4a - 2c + 7) + 25 =a+b+c-4a+2c-7+25=-3a+b+3c+18
b) -(3a)+(8-7a-8b)-20=-3a+8-7a-8b-20=-10a-8b-12
c) (1,5m+0,7n-1)+(4m+n-5)=1,5m+0,7n-1+4m+n-5=5,5m+1,7n-6
d) (a+b+c)-(4a-2c+7)+25=a+b+c-4a+2c-7+25=-3a+b+3c+18