7(a-1)+2(a-2)=a-7

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Solution for 7(a-1)+2(a-2)=a-7 equation:


Simplifying
7(a + -1) + 2(a + -2) = a + -7

Reorder the terms:
7(-1 + a) + 2(a + -2) = a + -7
(-1 * 7 + a * 7) + 2(a + -2) = a + -7
(-7 + 7a) + 2(a + -2) = a + -7

Reorder the terms:
-7 + 7a + 2(-2 + a) = a + -7
-7 + 7a + (-2 * 2 + a * 2) = a + -7
-7 + 7a + (-4 + 2a) = a + -7

Reorder the terms:
-7 + -4 + 7a + 2a = a + -7

Combine like terms: -7 + -4 = -11
-11 + 7a + 2a = a + -7

Combine like terms: 7a + 2a = 9a
-11 + 9a = a + -7

Reorder the terms:
-11 + 9a = -7 + a

Solving
-11 + 9a = -7 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-11 + 9a + -1a = -7 + a + -1a

Combine like terms: 9a + -1a = 8a
-11 + 8a = -7 + a + -1a

Combine like terms: a + -1a = 0
-11 + 8a = -7 + 0
-11 + 8a = -7

Add '11' to each side of the equation.
-11 + 11 + 8a = -7 + 11

Combine like terms: -11 + 11 = 0
0 + 8a = -7 + 11
8a = -7 + 11

Combine like terms: -7 + 11 = 4
8a = 4

Divide each side by '8'.
a = 0.5

Simplifying
a = 0.5

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