3 + 5x is the simplest expression of this problem.
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5x plus 3 does equal 3 plus 5x; commutative law.
(5x+3)(5x+3) x=(-3/5)
It is 5x - 9.
5x - 3 + 2x + 7 = ?7x + 5 = ?
0. 6x + 3 = 5x + 141. 6x = 5x + 11 [subtracting 3]2. x = 11 [subtracting 5x]