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78(5x-2)=90
We move all terms to the left:
78(5x-2)-(90)=0
We multiply parentheses
390x-156-90=0
We add all the numbers together, and all the variables
390x-246=0
We move all terms containing x to the left, all other terms to the right
390x=246
x=246/390
x=41/65
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