it is 45
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5x-19 = 16 5x = 16+19 5x = 35 x = 7
5x+1=20 5x=20-1 5x=19 5x/5=19/5 x=19/5
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
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5X - 19 = 16 add 19 to both sides 5X - 19 + 19 = 16 + 19 5X = 35 divide each sides integers by 5 (5/5)X = 35/5 X = 7 ---------------check in original equation 5(7) - 19 = 16 35 - 19 = 16 16 = 16 ------------checks