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put this solution on YOUR website!I am assuming we are solving for x
5x - 4x + 3 = 9 - x [given]
x + 3 = 9 - x [subtract 4x from 5x to make 1x]
2x + 3 = 9 [add an x to both sides to collect like terms]
2x = 6 [subtract 3 from each side to collect like terms]
x = 3 [divide by 2 on each side to solve for x]