(1)5x=24 5x÷5=24÷5 x=4.8 (2)7+13x=33 7+13x-7=33-7 13x=26 13x÷13=26÷13 x=2 (3)5x+9=21 5x+9-9=21-9 5x=12 5x÷5=12÷5 x=2.4 (4)(x+3)÷2=6 (x+3)÷2×2=6×2 x+3=12 x+3-3=12-3 x=9 (5)8x+6x=210 14x=210 14x÷14=210÷14 x=15