What is the answer to b+(2b+13)=76 ?

The answer to b+(2b+13)=76 is b=21

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b+(2b+13)=76

b + (2 b + 13) = 76

b = 21

Solution steps

b + (2 b + 13) = 76

Remove parentheses:

(a) = a

b + 2 b + 13 = 76

Add similar elements:

b + 2 b = 3 b

3 b + 13 = 76

Move

13

to the right side

3 b = 63

Divide both sides by

3

b = 21

2 x (x - 4) + 5 x (1 - x) = 3 (x + 1)

∣ x - 4 ∣ \leq 7

4 x + 1 = x + 7

x^{4} - 81 \geq 0

25 x^{2} + 49 = 70 x