5x+7=42 x%4.2=2 3.6x-x=3.25 2(x-3)=5.85x+7-7=42-7 x%4.2$4.2=2$4.2 2.6x=3.25 2x-6=5.85x=35 x=8.4 2.6x%2.6=3.25$2.6 2x-6+6=5.8+65x%5=35%5 x=1.25 2x=11.8x=7 2x%2=11.8%2 x=5.9打字很累,（注：%为除号,$为乘...