8 x 1.5 is the same thing as 4 x 3, which is 12
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x - 15 = - 8 add 15 to both sides: x -15 + 15 = -8 + 15 simplify both sides: x = 7
1over3x+x+x+8+x=15
15 x 8 = 120 To do more simply using LONG multiplication 15 x 8 80 ( 10 x 8 = 80) 40 ( 5 x 8 = 40) 120 ====
23
-7