90-15a=5(7a+4)

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Solution for 90-15a=5(7a+4) equation:


Simplifying
90 + -15a = 5(7a + 4)

Reorder the terms:
90 + -15a = 5(4 + 7a)
90 + -15a = (4 * 5 + 7a * 5)
90 + -15a = (20 + 35a)

Solving
90 + -15a = 20 + 35a

Solving for variable 'a'.

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

Add '-35a' to each side of the equation.
90 + -15a + -35a = 20 + 35a + -35a

Combine like terms: -15a + -35a = -50a
90 + -50a = 20 + 35a + -35a

Combine like terms: 35a + -35a = 0
90 + -50a = 20 + 0
90 + -50a = 20

Add '-90' to each side of the equation.
90 + -90 + -50a = 20 + -90

Combine like terms: 90 + -90 = 0
0 + -50a = 20 + -90
-50a = 20 + -90

Combine like terms: 20 + -90 = -70
-50a = -70

Divide each side by '-50'.
a = 1.4

Simplifying
a = 1.4

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