10(1+3b)=-20

10(1 + 3b) = - 20

Now multiply 10 in the bracket, then

10 + 30b = - 20

Now subtract 10 on both sides, we get

10 - 10 + 30b = - 20 - 10

30b = - 30

Now divide by 30 on both sides, we get

30b / 30 = - 30 / 30

b = -1

Hence b = -1

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