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x in (-oo:+oo)
a+(1/3)*x = 2*b // - 2*b
a-(2*b)+(1/3)*x = 0
a-2*b+(1/3)*x = 0
a-2*b+1/3*x = 0 // - a-2*b
1/3*x = -(a-2*b) // : 1/3
x = (-(a-2*b))/1/3
x = -3*(a-2*b)
x = -3*(a-2*b)
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