7a^2-[2a^2-(5a-5a^2+17)]=

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Solution for 7a^2-[2a^2-(5a-5a^2+17)]= equation:


Simplifying
7a2 + -1[2a2 + -1(5a + -5a2 + 17)] = 0

Reorder the terms:
7a2 + -1[2a2 + -1(17 + 5a + -5a2)] = 0
7a2 + -1[2a2 + (17 * -1 + 5a * -1 + -5a2 * -1)] = 0
7a2 + -1[2a2 + (-17 + -5a + 5a2)] = 0

Reorder the terms:
7a2 + -1[-17 + -5a + 2a2 + 5a2] = 0

Combine like terms: 2a2 + 5a2 = 7a2
7a2 + -1[-17 + -5a + 7a2] = 0
7a2 + [-17 * -1 + -5a * -1 + 7a2 * -1] = 0
7a2 + [17 + 5a + -7a2] = 0

Reorder the terms:
17 + 5a + 7a2 + -7a2 = 0

Combine like terms: 7a2 + -7a2 = 0
17 + 5a + 0 = 0
17 + 5a = 0

Solving
17 + 5a = 0

Solving for variable 'a'.

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

Add '-17' to each side of the equation.
17 + -17 + 5a = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 5a = 0 + -17
5a = 0 + -17

Combine like terms: 0 + -17 = -17
5a = -17

Divide each side by '5'.
a = -3.4

Simplifying
a = -3.4

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