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x in (-oo:+oo)
2*x-((7*x)/3)-3 = 4 // - 4
2*x-((7*x)/3)-4-3 = 0
2*x+(-7/3)*x-4-3 = 0
-1/3*x-7 = 0 // + 7
-1/3*x = 7 // : -1/3
x = 7/(-1/3)
x = -21
x = -21
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