5x - 3 = 12
Add 3 to both sides: 5x = 15
Divide both sides by 5: x = 3
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No. x=3. (5x3 is 15 or 5x =15-3=12)
13 ? 15
X = 4
3x+5=20 x=5 since 5x3+5=20
If you're asking what x equals, it equals 5 because 5x3=15, and 15-2=13.