[3x + 15] is not a question. It's a number, which we can't know
until we know what number 'x' is.
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3x - 5 + 3x = 1x + 15 3x + 3x -1x = 15 + 5 5x = 20 5x/5 = 20/5 x = 4
3x+12x = 15 15x = 15 x = 1
4x+7-3x = 15 4x-3x = 15-7 x = 8
Presumably, this is an equation in finding the value of x 3x+5/4 = -2x+15 3x+1.25 = -2x+15 3x+2x = 15-1.25 5x = 13.75 x = 2.75
3x + 15 = 603x = 60 - 153x = 45x = 45/3Therefore, x = 15.