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