3x = 7-5x
8x=7
x = 7/8
x = 0.875
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5x + 4 = 3x - 2Subtract 4 from both sides:5x = 3x - 6Subtract 2x from both sides:2x = 6Divide both sides by 2:x = -3
8x-4 = -7+5x 8x-5x = -7+4 3x = -3 x = -1
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y
So you have the problem 7 + 3x = 5x + 13you need to get all the x's to one side and all constants "like 7" to the other side.So from the left side, subtract 7 from that side but then subtract it from the 13 on the other side.Now you get 3x = 5x + 6Now subtract the 5x from the right side and from the left side.Now you get -2x = 6Divide the -2 from the x and from the 6 on the right side.Now you get x = -3
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