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\begin{array}{rcr} 4 x-5=6 \qquad & & \qquad 4 x-5=-6\\ 4 x=11 \qquad & \text {or} & \qquad 4 x=-1\\ x=\frac{11}{4} \qquad & & \qquad x=-\frac{1}{4} \end{array}