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x in (-oo:+oo)
53 = (-2/3)*x+15 // - (-2/3)*x+15
53-((-2/3)*x)-15 = 0
(2/3)*x-15+53 = 0
2/3*x+38 = 0 // - 38
2/3*x = -38 // : 2/3
x = -38/2/3
x = -57
x = -57
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