Question

A = 1/2(a+x)h solve for x

Answer 1

For this case we have the following equation:

$A = \frac {1} {2} (a + x) * h$

We must clear the variable "x":

We multiply by 2 on both sides of the equation:

$2A = (a + x) * h$

We divide by h on both sides of the equation:

$\frac {2A} {h} = a + x$

We subtract "a" on both sides of the equation:$\frac {2A} {h} -a = x$

Answer:$x = \frac {2A} {h} -a$