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x in (-oo:+oo)
X/3+3*x = 30 // - 30
X/3+3*x-30 = 0
1/3*X+3*x-30 = 0 // - 1/3*X-30
3*x = -(1/3*X-30) // : 3
x = (-(1/3*X-30))/3
x = (30-(1/3*X))/3
x = (30-(1/3*X))/3
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