3a+5.50(216-a)=865.50

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Solution for 3a+5.50(216-a)=865.50 equation: 


Simplifying
3a + 5.50(216 + -1a) = 865.50
3a + (216 * 5.50 + -1a * 5.50) = 865.50
3a + (1188 + -5.5a) = 865.50

Reorder the terms:
1188 + 3a + -5.5a = 865.50

Combine like terms: 3a + -5.5a = -2.5a
1188 + -2.5a = 865.50

Solving
1188 + -2.5a = 865.50

Solving for variable 'a'.

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

Add '-1188' to each side of the equation.
1188 + -1188 + -2.5a = 865.50 + -1188

Combine like terms: 1188 + -1188 = 0
0 + -2.5a = 865.50 + -1188
-2.5a = 865.50 + -1188

Combine like terms: 865.50 + -1188 = -322.5
-2.5a = -322.5

Divide each side by '-2.5'.
a = 129

Simplifying
a = 129

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