300-7[4(3+5)]+27=a

Solution for 300-7[4(3+5)]+27=a equation:

Simplifying
300 + -7[4(3 + 5)] + 27 = a

Combine like terms: 3 + 5 = 8
300 + -7[4(8)] + 27 = a

Multiply 4 * 8
300 + -7[32] + 27 = a

Multiply -7 * 32
300 + -224 + 27 = a

Combine like terms: 300 + -224 = 76
76 + 27 = a

Combine like terms: 76 + 27 = 103
103 = a

Solving
103 = 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.
103 + -1a = a + -1a

Combine like terms: a + -1a = 0
103 + -1a = 0

Add '-103' to each side of the equation.
103 + -103 + -1a = 0 + -103

Combine like terms: 103 + -103 = 0
0 + -1a = 0 + -103
-1a = 0 + -103

Combine like terms: 0 + -103 = -103
-1a = -103

Divide each side by '-1'.
a = 103

Simplifying
a = 103