100=4(20)+b

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Solution for 100=4(20)+b equation:


Simplifying
100 = 4(20) + b

Multiply 4 * 20
100 = 80 + b

Solving
100 = 80 + 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.
100 + -1b = 80 + b + -1b

Combine like terms: b + -1b = 0
100 + -1b = 80 + 0
100 + -1b = 80

Add '-100' to each side of the equation.
100 + -100 + -1b = 80 + -100

Combine like terms: 100 + -100 = 0
0 + -1b = 80 + -100
-1b = 80 + -100

Combine like terms: 80 + -100 = -20
-1b = -20

Divide each side by '-1'.
b = 20

Simplifying
b = 20

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