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4 = (7/4)*x-3 // - (7/4)*x-3
3-((7/4)*x)+4 = 0
(-7/4)*x+3+4 = 0
7-7/4*x = 0 // - 7
-7/4*x = -7 // : -7/4
x = -7/(-7/4)
x = 4
x = 4
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