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а. (12+5b)+(8a-11b)+(3b-5a)=
b. (8c²+3c)+(-7c-11c+3)-(-3c²-4)=
c. (3a-5y-8v)-(2x+7y-3v)+(5v-11x+y)=
а. (12+5b)+(8a-11b)+(3b-5a)=
b. (8c²+3c)+(-7c-11c+3)-(-3c²-4)=
c. (3a-5y-8v)-(2x+7y-3v)+(5v-11x+y)=
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12+5b+8a-11b+3b-5a
12-3b-3a
b.(8c²+3c)+(-7c-11c+3)-(-3c²-4)
8c²+3c-7c-11c+3+3c²+4
11c²-15c+7
c.(3a-5y-8v)-(2x+7y-3v)+(5v-11x+y)
3a-5y-8v-2x-7y+3v+5v-11x+y
3a-11y-13x