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12x-5+12x-11=12x-7+12x-9⇒12x-5-12x-9=12x-7-12x-11⇒2x-9-2x-52x-52x-9=2x-11-2x-72x-72x-11⇒2x-9-2x+54x2-18x-10x+45=2x-11-2x+74x2-22x-14x+77⇒-44x2-28x+45=-44x2-36x+77⇒14x2-28x+45=14x2-36x+77⇒4x2-28x+45=4x2-36x+77⇒4x2-28x-4x2+36x=77-45⇒8x=32∴x=328=4
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