90=-6a-4(-5a+2)

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Solution for 90=-6a-4(-5a+2) equation:


Simplifying
90 = -6a + -4(-5a + 2)

Reorder the terms:
90 = -6a + -4(2 + -5a)
90 = -6a + (2 * -4 + -5a * -4)
90 = -6a + (-8 + 20a)

Reorder the terms:
90 = -8 + -6a + 20a

Combine like terms: -6a + 20a = 14a
90 = -8 + 14a

Solving
90 = -8 + 14a

Solving for variable 'a'.

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

Add '-14a' to each side of the equation.
90 + -14a = -8 + 14a + -14a

Combine like terms: 14a + -14a = 0
90 + -14a = -8 + 0
90 + -14a = -8

Add '-90' to each side of the equation.
90 + -90 + -14a = -8 + -90

Combine like terms: 90 + -90 = 0
0 + -14a = -8 + -90
-14a = -8 + -90

Combine like terms: -8 + -90 = -98
-14a = -98

Divide each side by '-14'.
a = 7

Simplifying
a = 7

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