Answer
$10$
Work Step by Step
Distribute the 1/14 through on the left side. Then multiply both sides by 10.
$(15/7)x-(10/7)=x+10$
Subtract x from the left side and add (10/7) to the right side. Then multiply by (7/8) on both sides cancel and reduce.
$(7/8)(8/7)x=(80/7)(7/8)$
$x=10$