要解方程 \( 7.5 \times 2x = 15 \),步骤如下:
---
### **步骤 1:简化方程**
将左边的乘法项合并:
\[
7.5 \times 2x = 15 \implies 15x = 15
\]
---
### **步骤 2:解一元一次方程**
两边同时除以 15:
\[
x = \frac{15}{15} = 1
\]
---
### **验证答案**
将 \( x = 1 \) 代入原方程:
\[
7.5 \times 2 \times 1 = 15 \quad \checkmark
\]
---
**最终答案:**
\[
\boxed{x = 1}
\]