(53) 20x+4.5=16.5 (54) 9x+3.9=18.3(55) 4.7x+2.5=21.3 (56) 0.3x+5.3=12.2 (57) 6.4x+3.2=22.4(58) 6x-3.1=4.1 (59) 27x-1.4=6.7 (60) 12x-1.1=6.1(61) 0.8x-3.8=14.6 (62) 0.7x-2.6=16.3 (63) 0.3x-1.9=2.3(64) 79+17x=113 (65) 173+4x...