213.15=(x+7.30+2.40)*21

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Solution for 213.15=(x+7.30+2.40)*21 equation: 



213.15=(x+7.30+2.40)*21

We move all terms to the left:

213.15-((x+7.30+2.40)*21)=0

We add all the numbers together, and all the variables

-((x+9.7)*21)+213.15=0



We calculate terms in parentheses: -((x+9.7)*21), so:

(x+9.7)*21

We multiply parentheses

21x+203.7

Back to the equation:

-(21x+203.7)



We get rid of parentheses

-21x-203.7+213.15=0

We add all the numbers together, and all the variables

-21x+9.45=0

We move all terms containing x to the left, all other terms to the right

-21x=-9.45

x=-9.45/-21

x=2.7391304347826/6.0869565217391

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