8×(9-2)=8×9-8×
2.5×(6+4)=2.5×6+×4
7×(5+3)=7×5+×3
15×4-6×4=(15-)×4
6.4×5+3.6×5=(+3.6)×5
12×7+8×7=(12+)×7
8x+12=8(x+)
5x+35=5(x+)
3(x+2.5)=3x+
4(x+6)=4x+