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Math
Equations and Variables
Solving for an unknown variable
james collects 15 rocks. six of the rocks are smooth. the rest of the rocks,r are rough. which equation.can.be used to find how many rocks are rough? is it 15 equals 6+r or r=15+6 or 15=6-r or r=15divided by 6
1 answer
15 total rocks, so
r+6=15
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