1/2 of x and 10 is 30. Find the x.

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1/2 of x and 10 is 30. Find the x.

x and 10 means we add:
x + 10

1/2 of this:
1/2(x + 10)

The phrase is means equal to, so we set 1/2(x + 10) equal to 30 for our algebraic expression
1/2(x + 10) = 30