(b*7)-(b*3)=8.4

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Solution for (b*7)-(b*3)=8.4 equation: 


Simplifying
(b * 7) + -1(b * 3) = 8.4

Reorder the terms for easier multiplication:
(7b) + -1(b * 3) = 8.4

Reorder the terms for easier multiplication:
(7b) + -1(3b) = 8.4

Remove parenthesis around (3b)
(7b) + -1 * 3b = 8.4

Multiply -1 * 3
(7b) + -3b = 8.4

Combine like terms: (7b) + -3b = 4b
4b = 8.4

Solving
4b = 8.4

Solving for variable 'b'.

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

Divide each side by '4'.
b = 2.1

Simplifying
b = 2.1

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