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If a + B = - 1, find the value of algebraic formula 3 [a + b] - 5a-5b + 7 Formal addition and subtraction {two}
3[a+b]-5a-5b+7
=3[a+b]-5(a+b)+7
=3*(-1)-5*(-1)+7
=-3+5+7
=9
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