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1-((2/3)*x)-(2*x) = -77/3 // + -77/3
1-((2/3)*x)-(2*x)-(-77/3) = 0
(-2/3)*x-2*x+77/3+1 = 0
80/3-8/3*x = 0 // - 80/3
-8/3*x = -80/3 // : -8/3
x = -80/3/(-8/3)
x = 10
x = 10
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