The coefficients of each power of x, including the zeroth power which is not explicitly written as part of the numbers not prefixed to any particular power of x, are added separately. In this instance, the result is 15x + 32.
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If: 9x+7 = 6x+25 Then: x = 6
6x + 47 = 9x + 11 6x + 36 = 9x 36 = 3x 12 = x
9x + 3 - 6x - 2 = 3x + 1
144
9x-11 = 6x+1 9x-6x = 1+11 3x = 12 x = 4