a+a+a+a+70+80=100

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Solution for a+a+a+a+70+80=100 equation:


Simplifying
a + a + a + a + 70 + 80 = 100

Reorder the terms:
70 + 80 + a + a + a + a = 100

Combine like terms: 70 + 80 = 150
150 + a + a + a + a = 100

Combine like terms: a + a = 2a
150 + 2a + a + a = 100

Combine like terms: 2a + a = 3a
150 + 3a + a = 100

Combine like terms: 3a + a = 4a
150 + 4a = 100

Solving
150 + 4a = 100

Solving for variable 'a'.

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

Add '-150' to each side of the equation.
150 + -150 + 4a = 100 + -150

Combine like terms: 150 + -150 = 0
0 + 4a = 100 + -150
4a = 100 + -150

Combine like terms: 100 + -150 = -50
4a = -50

Divide each side by '4'.
a = -12.5

Simplifying
a = -12.5

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