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

Reorder the terms for easier multiplication:
21 + 7 * 2(12 + y) = 100

Multiply 7 * 2
21 + 14(12 + y) = 100
21 + (12 * 14 + y * 14) = 100
21 + (168 + 14y) = 100

Combine like terms: 21 + 168 = 189
189 + 14y = 100

Solving
189 + 14y = 100

Solving for variable 'y'.

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

Add '-189' to each side of the equation.
189 + -189 + 14y = 100 + -189

Combine like terms: 189 + -189 = 0
0 + 14y = 100 + -189
14y = 100 + -189

Combine like terms: 100 + -189 = -89
14y = -89

Divide each side by '14'.
y = -6.357142857

Simplifying
y = -6.357142857

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