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15x-12+8x-4=
____23x-16____
b)
-2(4a-5b+13)-(5a-13)=
-8a+10b-26-5a+13=
____13a+10b-13____
Jeśli czegoś nie rozumiesz, to pytaj :)
3 (5x-4)+4 (2x-1)=15x-12+8x-4=23x-16
2)
-2 (4a-5b+13)-(5a-13)=-8a+10b-26-5a+13=10b-13a-13