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-13a=260
We move all terms to the left:
-13a-(260)=0
We move all terms containing a to the left, all other terms to the right
-13a=260
a=260/-13
a=-20
| 8/n=40/15 | | 2+3c=-2(-2c+6)) | | 2+3c=-2(-2c+6)) | | 2r+1.9=1.9 | | 5n+1=1+6n | | 0.07x0.04(6,000.00x)=360.00 | | 180=7x+91 | | 0.04x0.07(6,000.00x)=360.00 | | 7x+91=180 | | 0.07x0.04(6,000.00x)=360.00 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 7x+91=180 | | 85=5+(10Xn) | | 85=5+(10Xn) |