Answer:x = 5Step-by-step explanation:3x + 1 = 16Subtracting 1 on both sides of the equation,3x + 1 β 1 = 16 β 1Summing algebraically (in this case subtracting by having different signs) on both sides,3x = 15Isolating x by dividing both sides by 33x / 3 = 15 / 3 Dividing,x = 5