3(b+7)+5(2b+1)=91

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Solution for 3(b+7)+5(2b+1)=91 equation:


Simplifying
3(b + 7) + 5(2b + 1) = 91

Reorder the terms:
3(7 + b) + 5(2b + 1) = 91
(7 * 3 + b * 3) + 5(2b + 1) = 91
(21 + 3b) + 5(2b + 1) = 91

Reorder the terms:
21 + 3b + 5(1 + 2b) = 91
21 + 3b + (1 * 5 + 2b * 5) = 91
21 + 3b + (5 + 10b) = 91

Reorder the terms:
21 + 5 + 3b + 10b = 91

Combine like terms: 21 + 5 = 26
26 + 3b + 10b = 91

Combine like terms: 3b + 10b = 13b
26 + 13b = 91

Solving
26 + 13b = 91

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-26' to each side of the equation.
26 + -26 + 13b = 91 + -26

Combine like terms: 26 + -26 = 0
0 + 13b = 91 + -26
13b = 91 + -26

Combine like terms: 91 + -26 = 65
13b = 65

Divide each side by '13'.
b = 5

Simplifying
b = 5

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