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1/2*x*3 is 1.5x
4*4+4=20
Three times five equal 15 all u need to do is count by five 5,10,15
1 3/4 x 3 1/2 equals 6 1/8 or 6.125
x + x + 1 + x + 2 = 3x + 3 = 3 times the middle number