You can put this solution on YOUR website! Based on how you expressed your formula -- it could be interpreted in one of two ways -- I'll show you BOTH cases. (I think you mean Case #1)
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Case #1, if you mean:
multiply both sides by 5: (answer for case 1)
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Case #2, if you mean:
multiply both sides by 5b:
divide both sides by -40: (answer for case 2)