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Simplifying 7(a + -3) = 21 Reorder the terms: 7(-3 + a) = 21 (-3 * 7 + a * 7) = 21 (-21 + 7a) = 21 Solving -21 + 7a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7a = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 7a = 21 + 21 7a = 21 + 21 Combine like terms: 21 + 21 = 42 7a = 42 Divide each side by '7'. a = 6 Simplifying a = 6
| 6x+6=x+3 | | 2=c+5-12 | | p-0.2p=64.80 | | 10x-36=4x-12 | | 2.2/n=4.8/18 | | P(2)=f | | 9k-(9+k)=-(5k+9) | | 5t-2(2t+8)=16 | | 5a+14a=-2a | | 16=2-(y+6) | | 5a-14a=-2a | | -13(-2x-12)=6x+16 | | 17y=4(4x-6) | | 4(-8x-20)=11x+6x | | 4(z+1)=3(z-8)+z | | 3x-29=-15x-11 | | 0.55x+0.2x=x-17.5 | | 7*(5+7)= | | (4+W)(5W-6)=0 | | -3+10=15r-8 | | -3x+11=4+15x | | 8+9*9= | | 4x^3+2x^2-8x+3=0 | | 1/3h-h=24 | | 21+3i=0 | | x^4-x^2+2x=0 | | 3y+10=29 | | (x^3)+3x^2-2x-4=0 | | x+0.20x=31500 | | x+0.20x=31,500 | | -10x+10= | | 6/0.2 |