I'm pretty sure this isn't right but if x=6 and y=15 then it is just 6 + 15 which is 21.
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We cannot find out the y and x intercept for the equation 3x plus 5y equals -15 by a single equation . But , we can try a hit and trial method for the same . when x =0 y =-3. when y=0 x=-5.
x + 7 + y
x + y + z = x + z + y is the commutative property of addition.
X = 135 and y = 15 Solved by addition and substitution
If you mean: x+y = 30 and the value of y is 15 then the value of x is also 15