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5 - x + 10 = 2x + 4
5 + 10 - x = 2x + 4
15 - x = 2x + 4
15 - 4 = 2x + x
11 = 3x
11/3 = x
5+10 -4 =2x+x
15-4 = 3x
11 = 3x
11/3 = x