You can't solve it - you only have one equation and two unknowns. You need 2 equations to solve this.
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If you mean sqrt (3w +13) = sqrt(5w-7) with all terms under the radical, then just square both sides. then; 3w+13 = 5w-7 ( subtract 3w from each side ) 13 = 2w-7 ( add 7 to both sides ) 20 = 2w 10 = w
3w + 12
7+3w-13x
n= -2
7