x-1.8x+1.3=28.3 (15) 15x-50=115(16) 16.5+10x=36.5 (17) 9x-1=11.6 (18) 21x+1.5=5.7(19) 4(0.5x+6.1)=42.4 (20) 19x+8x=54 (21) 8.2x-2.9x+4.7=63(22) 55x+5x-2.2=51.8 (23) 18x+32×3=222 (24) 0.2x÷32=0.4(25) 22+38x=136 (26) 28x-...