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Simplifying (a + 4) + (a + 3) = 21 Reorder the terms: (4 + a) + (a + 3) = 21 Remove parenthesis around (4 + a) 4 + a + (a + 3) = 21 Reorder the terms: 4 + a + (3 + a) = 21 Remove parenthesis around (3 + a) 4 + a + 3 + a = 21 Reorder the terms: 4 + 3 + a + a = 21 Combine like terms: 4 + 3 = 7 7 + a + a = 21 Combine like terms: a + a = 2a 7 + 2a = 21 Solving 7 + 2a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2a = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 2a = 21 + -7 2a = 21 + -7 Combine like terms: 21 + -7 = 14 2a = 14 Divide each side by '2'. a = 7 Simplifying a = 7
| m-t=-3p*2 | | 2(2x+5)+2l= | | 0.5x^2+27=54-4.5*0.5x-3*0.5x | | 5+8c= | | -8x-15=-143 | | 3(x+8)=2(4x+27) | | 3x+11-x=8+4x-7 | | 3(x-6)+1=3x-16 | | x/10=1/9(247-x) | | x+1-2x-2=1 | | n-4/2.5=4.5 | | 12.3=0.41x | | 9x-9+7x= | | 1/2x=2/5 | | 18=15-10x | | M-t=3p*2 | | 8(x-7)+25=8x-31 | | 80=1.05p^8 | | x^2+1=2(5x-12) | | 4/5y-1/3y=14 | | 5x+-6=18 | | 3(9-2x)=15 | | 2.4*3+1.5=8.7 | | 3.8*3-1.4=9 | | -12=2/3x | | 3(x+9)=2(3x+27) | | 9x^4+123x+400=0 | | 14x=1176 | | 7cos^2x+2cosx=0 | | 0.70x+0.05(8-x)=0.10(-9) | | 2=h/3 | | 36-32a+a=0 |