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1x+2+1x+5=1x+4+1x+3⇒1x+2-1x+4=1x+3-1x+5⇒x+4-x-2x2+4x+2x+8=x+5-x-3x2+5x+3x+15⇒2x2+6x+8=2x2+8x+15⇒1x2+6x+8=1x2+8x+15⇒x2+8x+15=x2+6x+8⇒x2+8x-x2-6x=8-15⇒2x=-7⇒x=-72∴x=-72
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