im guessing youre soling for x so,
1/2x-5=10 ; first step add 5 to both sides
+5=+5
1/2x=15 ; do get rid of the fraction and get x alone multiply both sides by 2
(2)1/2x=15(2) : the 2 is the recipicol of 1/2 cancelling it out.
x=30
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