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3-((9*x)/2) = -4 // + 4
3-((9*x)/2)+4 = 0
(-9/2)*x+3+4 = 0
7-9/2*x = 0 // - 7
-9/2*x = -7 // : -9/2
x = -7/(-9/2)
x = 14/9
x = 14/9
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