45.
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1 x 15, 3 x 5, 5 x 3, 15 x 1 = 15
If that's - 2x - 15, the answer is either (x - 5) or (x + 3)
3+4x=15 4x=15-3 4x=12 x=12/4 x=3 The check is: If x=3 then, 3+ (4 X 3)=15 3+12=15
3 x 5 = 15 15 x 6 = 90 Answer: 90
x/5 = 3 Multiply both sides by '5' x = 15