\[-10.5=-4.9-r\]
1
Add 4.94.9 to both sides.
−10.5+4.9=−r-10.5+4.9=-r

2
Simplify  −10.5+4.9-10.5+4.9  to  −5.6-5.6.
−5.6=−r-5.6=-r

3
Multiply both sides by −1-1.
5.6=r5.6=r

4
Switch sides.
r=5.6r=5.6

Done

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