2x + 7 + 5x = 7 ( x + 8) how many solutions?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Hurry and answer this! circle x with a radius of 6 units and circle y with a radius of 2 units are shown which steps would prove the circles similar? translate the circles so they share a common center point, and dilate circle y by a scale factor of 4. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 4. translate the circles so they share a common center point, and dilate circle y by a scale factor of 3. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 3

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?