100a+10(9)=40(a+9)

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Solution for 100a+10(9)=40(a+9) equation:


Simplifying
100a + 10(9) = 40(a + 9)

Multiply 10 * 9
100a + 90 = 40(a + 9)

Reorder the terms:
90 + 100a = 40(a + 9)

Reorder the terms:
90 + 100a = 40(9 + a)
90 + 100a = (9 * 40 + a * 40)
90 + 100a = (360 + 40a)

Solving
90 + 100a = 360 + 40a

Solving for variable 'a'.

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

Add '-40a' to each side of the equation.
90 + 100a + -40a = 360 + 40a + -40a

Combine like terms: 100a + -40a = 60a
90 + 60a = 360 + 40a + -40a

Combine like terms: 40a + -40a = 0
90 + 60a = 360 + 0
90 + 60a = 360

Add '-90' to each side of the equation.
90 + -90 + 60a = 360 + -90

Combine like terms: 90 + -90 = 0
0 + 60a = 360 + -90
60a = 360 + -90

Combine like terms: 360 + -90 = 270
60a = 270

Divide each side by '60'.
a = 4.5

Simplifying
a = 4.5

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