-21+6(-3b+5)+9(2b-1)=

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Solution for -21+6(-3b+5)+9(2b-1)= equation: 


Simplifying
-21 + 6(-3b + 5) + 9(2b + -1) = 0

Reorder the terms:
-21 + 6(5 + -3b) + 9(2b + -1) = 0
-21 + (5 * 6 + -3b * 6) + 9(2b + -1) = 0
-21 + (30 + -18b) + 9(2b + -1) = 0

Reorder the terms:
-21 + 30 + -18b + 9(-1 + 2b) = 0
-21 + 30 + -18b + (-1 * 9 + 2b * 9) = 0
-21 + 30 + -18b + (-9 + 18b) = 0

Reorder the terms:
-21 + 30 + -9 + -18b + 18b = 0

Combine like terms: -21 + 30 = 9
9 + -9 + -18b + 18b = 0

Combine like terms: 9 + -9 = 0
0 + -18b + 18b = 0
-18b + 18b = 0

Combine like terms: -18b + 18b = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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