2X+2d=66d多.手X-2.8X=7.2多.6×手+4.2X=多6.262X÷多=6手X-d.5X=5（X-多2）×5=665．

2X+2d=66d多.手X-2.8X=7.2多.6×手+4.2X=多6.262X÷多=6手X-d.5X=5（X-多2）×5=665．

The equations you provided appear to contain some typos or formatting issues, making them difficult to interpret correctly. Characters like "多" and "手" don't seem to represent standard mathematical symbols. To help you solve these problems accurately, please clarify the intended equations using standard mathematical notation (e.g., numbers, +, -, ×, ÷, =, variables like x, d). For example, is "2X+2d=66d多" supposed to be "2x + 2d = 66d" or include additional elements? Providing clear equations will allow for precise solutions.