x + 3x + 5x is effectively a single term. A single term cannot have a greatest COMMON factor where the word common implies that it refers to two or more terms.
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3x + x + 10 + x = 5x + 10
5x+3 = 3x+11 5x-3x = 11-3 2x = 8 x = 4
5x-3x+x+8 = 2x+1+x+x 3x+8 = 4x+1 3x-4x = 1-8 -x = -7 x=7 Hope that helps.
If: 3x-7 = 5x+13 Then: x = -10
122-5x = 3x+10 122-10 = 3x+5x 112 = 8x 112/8 = x x = 14