3*(3.5-1b)+1b=7.5

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Solution for 3*(3.5-1b)+1b=7.5 equation: 


Simplifying
3(3.5 + -1b) + 1b = 7.5
(3.5 * 3 + -1b * 3) + 1b = 7.5
(10.5 + -3b) + 1b = 7.5

Combine like terms: -3b + 1b = -2b
10.5 + -2b = 7.5

Solving
10.5 + -2b = 7.5

Solving for variable 'b'.

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

Add '-10.5' to each side of the equation.
10.5 + -10.5 + -2b = 7.5 + -10.5

Combine like terms: 10.5 + -10.5 = 0.0
0.0 + -2b = 7.5 + -10.5
-2b = 7.5 + -10.5

Combine like terms: 7.5 + -10.5 = -3
-2b = -3

Divide each side by '-2'.
b = 1.5

Simplifying
b = 1.5

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