21+2(21+3)+(4*21-5)=c

Solution for 21+2(21+3)+(4*21-5)=c equation:

Simplifying
21 + 2(21 + 3) + (4 * 21 + -5) = c

Combine like terms: 21 + 3 = 24
21 + 2(24) + (4 * 21 + -5) = c

Multiply 2 * 24
21 + 48 + (4 * 21 + -5) = c

Multiply 4 * 21
21 + 48 + (84 + -5) = c

Combine like terms: 84 + -5 = 79
21 + 48 + (79) = c
21 + 48 + 79 = c

Combine like terms: 21 + 48 = 69
69 + 79 = c

Combine like terms: 69 + 79 = 148
148 = c

Solving
148 = c

Solving for variable 'c'.

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

Add '-1c' to each side of the equation.
148 + -1c = c + -1c

Combine like terms: c + -1c = 0
148 + -1c = 0

Add '-148' to each side of the equation.
148 + -148 + -1c = 0 + -148

Combine like terms: 148 + -148 = 0
0 + -1c = 0 + -148
-1c = 0 + -148

Combine like terms: 0 + -148 = -148
-1c = -148

Divide each side by '-1'.
c = 148

Simplifying
c = 148