3(9-4)+2(9+1)=10-5a

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Solution for 3(9-4)+2(9+1)=10-5a equation: 


Simplifying
3(9 + -4) + 2(9 + 1) = 10 + -5a

Combine like terms: 9 + -4 = 5
3(5) + 2(9 + 1) = 10 + -5a

Multiply 3 * 5
15 + 2(9 + 1) = 10 + -5a

Combine like terms: 9 + 1 = 10
15 + 2(10) = 10 + -5a

Multiply 2 * 10
15 + 20 = 10 + -5a

Combine like terms: 15 + 20 = 35
35 = 10 + -5a

Solving
35 = 10 + -5a

Solving for variable 'a'.

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

Add '5a' to each side of the equation.
35 + 5a = 10 + -5a + 5a

Combine like terms: -5a + 5a = 0
35 + 5a = 10 + 0
35 + 5a = 10

Add '-35' to each side of the equation.
35 + -35 + 5a = 10 + -35

Combine like terms: 35 + -35 = 0
0 + 5a = 10 + -35
5a = 10 + -35

Combine like terms: 10 + -35 = -25
5a = -25

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

Simplifying
a = -5

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