if you meant 5x+9=3*15 then, 5x = 36, x = 7.2
if you meant 5x+9=3x+15 then, 2x = 6, x = 3
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3x-4=5x+6 gives: 2x=-10 which gives x=-5
6 + 2x = 5x + 9 , 6 - 9 = 5x - 2x , -3 = 3x , x = -1
8x-4 = -7+5x 8x-5x = -7+4 3x = -3 x = -1
5x + 4 = 3x - 2Subtract 4 from both sides:5x = 3x - 6Subtract 2x from both sides:2x = 6Divide both sides by 2:x = -3
There are 2 unknowns