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1.8-(0.63*x) = 0.7*((0.3*x)/10.9) // - 0.7*((0.3*x)/10.9)
1.8-(0.63*x)-(0.7*((0.3*x)/10.9)) = 0
1.8-0.63*x-0.01926606*x = 0
1.8-0.64926606*x = 0 // - 1.8
-0.64926606*x = -1.8 // : -0.64926606
x = -1.8/(-0.64926606)
x = 2.77236115
x = 2.77236115
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