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x in (-oo:+oo)
3*(2/3+15) = 7-2*x // - 7-2*x
3*(2/3+15)-(-2*x)-7 = 0
2*x+3*(2/3+15)-7 = 0
2*x+40 = 0 // - 40
2*x = -40 // : 2
x = -40/2
x = -20
x = -20
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