10a+5[a-3]=15

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Solution for 10a+5[a-3]=15 equation:


Simplifying
10a + 5[a + -3] = 15

Reorder the terms:
10a + 5[-3 + a] = 15
10a + [-3 * 5 + a * 5] = 15
10a + [-15 + 5a] = 15

Reorder the terms:
-15 + 10a + 5a = 15

Combine like terms: 10a + 5a = 15a
-15 + 15a = 15

Solving
-15 + 15a = 15

Solving for variable 'a'.

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

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

Combine like terms: -15 + 15 = 0
0 + 15a = 15 + 15
15a = 15 + 15

Combine like terms: 15 + 15 = 30
15a = 30

Divide each side by '15'.
a = 2

Simplifying
a = 2

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