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3x+5=30

so, separate the x and normal digits so it will become 3x=30-5

so,now you can subtract so it will be 3x=25

you have to remember always that the sign must change while going to the opposite side as( -) will become (+) and( ÷) will become(×) or vice versa. so now if we have to seperate 3x so it will be x=5÷3