Define an operation in the range of rational number, the rule is: a * b = ab-b & # 178; (1) if (2x + 1) * - 3) = 0, find the value of X

Define an operation in the range of rational number, the rule is: a * b = ab-b & # 178; (1) if (2x + 1) * - 3) = 0, find the value of X

That is, a = 2x + 1
b=-3
So - 3 (2x + 1) - (- 3) &# = 0
3(2x+1)=-9
2x+1=-3
x=-2