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(3*x+10.5)/2 = 2*x+0.75 // - 2*x+0.75
(3*x+10.5)/2-(2*x)-0.75 = 0
(3*x+10.5)/2-2*x-0.75 = 0
(3*x+10.5)/2+(-2*2*x)/2+(-0.75*2)/2 = 0
3*x-2*2*x-0.75*2+10.5 = 0
10.5-x-1.5 = 0
9-x = 0
(9-x)/2 = 0
(9-x)/2 = 0 // * 2
9-x = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x = 9
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