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3*x-7+1 = (5/3)*x // - (5/3)*x
3*x-((5/3)*x)-7+1 = 0
3*x+(-5/3)*x-7+1 = 0
4/3*x-6 = 0 // + 6
4/3*x = 6 // : 4/3
x = 6/4/3
x = 9/2
x = 9/2
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