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42=-5(-5-7r)+6(5r-8)
We simplify the equation to the form, which is simple to understand
42=-5(-5-7r)+6(5r-8)
Reorder the terms in parentheses
42=+(+25+35r)+6*(5r-8)
Remove unnecessary parentheses
+42=+25+35r+6+*(+5r-8+)
Reorder the terms in parentheses
42=+25+35r+(+30r-48)
Remove unnecessary parentheses
+42=+25+35r+30r-48
We move all terms containing r to the left and all other terms to the right.
-35r-30r=+25-48-42
We simplify left and right side of the equation.
-65r=-65
We divide both sides of the equation by -65 to get r.
r=1
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