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105=0.7(200-x)
We move all terms to the left:
105-(0.7(200-x))=0
We add all the numbers together, and all the variables
-(0.7(-1x+200))+105=0
We calculate terms in parentheses: -(0.7(-1x+200)), so:We get rid of parentheses
0.7(-1x+200)
We multiply parentheses
-0.7x+140
Back to the equation:
-(-0.7x+140)
0.7x-140+105=0
We add all the numbers together, and all the variables
0.7x-35=0
We move all terms containing x to the left, all other terms to the right
0.7x=35
x=35/0.7
x=50
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