21+7(12+y)-2=100

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Solution for 21+7(12+y)-2=100 equation:


Simplifying
21 + 7(12 + y) + -2 = 100
21 + (12 * 7 + y * 7) + -2 = 100
21 + (84 + 7y) + -2 = 100

Reorder the terms:
21 + 84 + -2 + 7y = 100

Combine like terms: 21 + 84 = 105
105 + -2 + 7y = 100

Combine like terms: 105 + -2 = 103
103 + 7y = 100

Solving
103 + 7y = 100

Solving for variable 'y'.

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

Add '-103' to each side of the equation.
103 + -103 + 7y = 100 + -103

Combine like terms: 103 + -103 = 0
0 + 7y = 100 + -103
7y = 100 + -103

Combine like terms: 100 + -103 = -3
7y = -3

Divide each side by '7'.
y = -0.4285714286

Simplifying
y = -0.4285714286

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