-9(-7)=b

Solution for -9(-7)=b equation:

Simplifying
-9(-7) = b

Multiply -9 * -7
63 = b

Solving
63 = b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
63 + -1b = b + -1b

Combine like terms: b + -1b = 0
63 + -1b = 0

Add '-63' to each side of the equation.
63 + -63 + -1b = 0 + -63

Combine like terms: 63 + -63 = 0
0 + -1b = 0 + -63
-1b = 0 + -63

Combine like terms: 0 + -63 = -63
-1b = -63

Divide each side by '-1'.
b = 63

Simplifying
b = 63