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X/27 = 4 Multiply both sides by 27: X = 4*27 = 108
x2 = 9, 3 x 9 = 27, 27 - 4 = 23
4 x 20 = 80 4 x 7 = 28 80 + 28 = 108 4 x 27 = 108
x=4
x+27=43 x+27-27=43-27 x+0=16