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The sum is 28x
68 + 28x - 28 = 236 28x + 68 - 68 -28 + 28 = 236 - 68 + 28 28x = 196 x = 7
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5x + 23x + 10 = 28x + 10( ? ? ? )
7x+7=28x 28x-7x=7 21x=7 x=3