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2.1*((6*x)/3-4.7) = 20 // - 20
2.1*((6*x)/3-4.7)-20 = 0
2.1*(2*x-4.7)-20 = 0
2.1*(2*x-4.7)-20 = 0
4.2*x-29.87 = 0
4.2*x-29.87 = 0
4.2*x-29.87 = 0 // + 29.87
4.2*x = 29.87 // : 4.2
x = 29.87/4.2
x = 7.11190476
x = 7.11190476
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