Equivalent to what?
"3x = 3 + x" is an equation which can be equivalent to other equations, but none is mentioned.
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x = 0
if 3x+7 = 3 then 3x = 3-7 3x = -4 then, x = -4/3
equivalent to 3x -6 = -9; so 3x = -9 + 6; so 3x = -3 so x = -1. Check: -6 + (3 * -1) = -6 + (-3) = -9 QED
5x+3 = 3x+11 5x-3x = 11-3 2x = 8 x = 4
3+3x+7x=13 3x+7x=10 10x=10 x=1