-7=-7(9)+b

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


Simplifying
-7 = -7(9) + b

Multiply -7 * 9
-7 = -63 + b

Solving
-7 = -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.
-7 + -1b = -63 + b + -1b

Combine like terms: b + -1b = 0
-7 + -1b = -63 + 0
-7 + -1b = -63

Add '7' to each side of the equation.
-7 + 7 + -1b = -63 + 7

Combine like terms: -7 + 7 = 0
0 + -1b = -63 + 7
-1b = -63 + 7

Combine like terms: -63 + 7 = -56
-1b = -56

Divide each side by '-1'.
b = 56

Simplifying
b = 56

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