You can't answer this question without setting that expression equal to something. Right now, your equation reads 4x+15=?, essentially created a system of two variables with only one equation, which is unsolvable.
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If: 4x = x+15 Then: x = 5
y = 2x + 15 y = 4x + 7 Substitute the value of y from the first equation into the second: 2x + 15 = 4x + 7 Subtract 2x from both sides: 15 = 2x + 7 Subtract 7 from both sides: 8 = 2x Divide both sides by 2: 4 = x. Replace x by its value, 4, in the first equation: y = 2*4 + 15 = 8 + 15 = 23 So the solution is (x, y) = (4, 23)
3x+5= 4x-10+10 +103x+15= 4x-3x -3x15=X
4x - 7 = -15 4x = -8 x = -2
x2 + 4x + 3 = (x + 1)(x + 3)