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1.4*x-9 = (3*x)/2 // - (3*x)/2
1.4*x-((3*x)/2)-9 = 0
1.4*x+(-3/2)*x-9 = 0
-0.1*x-9 = 0 // + 9
-0.1*x = 9 // : -0.1
x = 9/(-0.1)
x = -90
x = -90
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