4x + 7 is an expression, not an equation. Only an equation (or an inequality) can have solutions, an expression cannot have a solution.
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4x-y+7=0
(The original question was misphrased.) 4x-7 = 2x+5 resolves as 2x-7 = 5 2x = 12 x = 6
If: 5x = 4x+7 Then: 5x-4x = 7 And: x = 7
4x - 5 + 2x = 376x - 5 = 376x = 37 + 56x = 42x = 42 / 6x = 7
If: 4x+3x = 35Then: 7x = 35So: x = 35/7 => x = 5