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15-((8*(x-6))/4) = -2.25 // + 2.25
2.25-((8*(x-6))/4)+15 = 0
2.25-2*(x-6)+15 = 0
2.25-2*(x-6)+15 = 0
14.25-2*x+15 = 0
29.25-2*x = 0
29.25-2*x = 0
29.25-2*x = 0 // - 29.25
-2*x = -29.25 // : -2
x = -29.25/(-2)
x = 14.625
x = 14.625
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