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Simplifying (a + 3) + -6 = 21 Reorder the terms: (3 + a) + -6 = 21 Remove parenthesis around (3 + a) 3 + a + -6 = 21 Reorder the terms: 3 + -6 + a = 21 Combine like terms: 3 + -6 = -3 -3 + a = 21 Solving -3 + a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = 21 + 3 Combine like terms: -3 + 3 = 0 0 + a = 21 + 3 a = 21 + 3 Combine like terms: 21 + 3 = 24 a = 24 Simplifying a = 24
| 1/2=1/2t+3 | | .07(6x-6)=.42(x+7)-3.36 | | 2x+3.8=14.2 | | 6+2a+4=18 | | 4r-2=18 | | 2x+2(4x+9)=-2 | | 3x^4+2x^2-20=0 | | 5(3x-6x)-x=-24+8x | | 15ab+15a+6b=4 | | 150=55+(15+9)w | | 2+x+10=2x+12 | | 7m+7-2m= | | c+5-6=-4 | | 2x-2(6x-5y)= | | b=55+(15+9) | | 10xy=x+12 | | 2x^2+28x+66=0 | | 2x^2+22x+66=0 | | 150=55+(15+9) | | 12x=4x+24-2x | | 18=-d+6 | | 7k-2k+k= | | 5a+8=a-4 | | b^4-3b^2+4=0 | | 5x-40=8+60x | | 8c-5c= | | 90=6(1+2r) | | 28-8x=-3(x-1) | | 45p+0.24=65p+0.23 | | 9x-36=5x+132 | | 27+0.15p=51 | | 7m+31=10 |