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2.1*((6*x)/3-4.7) = 8.66 // - 8.66
2.1*((6*x)/3-4.7)-8.66 = 0
2.1*(2*x-4.7)-8.66 = 0
2.1*(2*x-4.7)-8.66 = 0
4.2*x-18.53 = 0
4.2*x-18.53 = 0
4.2*x-18.53 = 0 // + 18.53
4.2*x = 18.53 // : 4.2
x = 18.53/4.2
x = 4.41190476
x = 4.41190476
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