f(4)=18(4)+13

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Solution for f(4)=18(4)+13 equation: 


Simplifying
f(4) = 18(4) + 13

Reorder the terms for easier multiplication:
4f = 18(4) + 13

Multiply 18 * 4
4f = 72 + 13

Combine like terms: 72 + 13 = 85
4f = 85

Solving
4f = 85

Solving for variable 'f'.

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

Divide each side by '4'.
f = 21.25

Simplifying
f = 21.25

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