Solve for j F=(j+r)/2

$F = \frac{j + r}{2}$

Rewrite the equation as $\frac{j + r}{2} = F$ .

$\frac{j + r}{2} = F$

Multiply both sides of the equation by $2$ .

$2 \frac{j + r}{2} = 2 F$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$2 \frac{j + r}{2} = 2 F$

Rewrite the expression.

$j + r = 2 F$

$j + r = 2 F$

$j + r = 2 F$

Subtract $r$ from both sides of the equation.

$j = 2 F - r$

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