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5x-10.5=3(x-10.5)
We move all terms to the left:
5x-10.5-(3(x-10.5))=0
We calculate terms in parentheses: -(3(x-10.5)), so:We get rid of parentheses
3(x-10.5)
We multiply parentheses
3x-31.5
Back to the equation:
-(3x-31.5)
5x-3x+31.5-10.5=0
We add all the numbers together, and all the variables
2x+21=0
We move all terms containing x to the left, all other terms to the right
2x=-21
x=-21/2
x=-10+1/2
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