13.2-3.5x=2.8x-1.9213.2+1.92=2.8x+3.5x6.3x=15.12x=15.12÷6.3x=2.4
13.2-3.5x=2.8x-1.9213.2-3.5x+3.5x=2.8x-1.92+3.5x13.2=6.3x-1.9213.2+1.92=6.3x-1.92+1.9215.12=6.3x6.3x=15.126.3x÷6.3=15.12÷6.3x=2.4望采纳，谢谢
