2(a-b)+5(a+b)=13

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Solution for 2(a-b)+5(a+b)=13 equation:


Simplifying
2(a + -1b) + 5(a + b) = 13
(a * 2 + -1b * 2) + 5(a + b) = 13
(2a + -2b) + 5(a + b) = 13
2a + -2b + (a * 5 + b * 5) = 13
2a + -2b + (5a + 5b) = 13

Reorder the terms:
2a + 5a + -2b + 5b = 13

Combine like terms: 2a + 5a = 7a
7a + -2b + 5b = 13

Combine like terms: -2b + 5b = 3b
7a + 3b = 13

Solving
7a + 3b = 13

Solving for variable 'a'.

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

Add '-3b' to each side of the equation.
7a + 3b + -3b = 13 + -3b

Combine like terms: 3b + -3b = 0
7a + 0 = 13 + -3b
7a = 13 + -3b

Divide each side by '7'.
a = 1.857142857 + -0.4285714286b

Simplifying
a = 1.857142857 + -0.4285714286b

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