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3x+5-4=13
3x+1=13
3x=12
x=4
(3x+2+3)-4=13
3x+5-4=13
3x=12
x=4
[(3x+2)+3] = 17
(3x+2)+3 = 17
(3x+2) = 14
3x + 2 = 14
3x = 12
x = 4